EtherNet/IP Network Configuration User Manual, ENET UM001O EN P 2100 Classic Um001

User Manual: 2100 Classic

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User Manual
Original Instructions

EtherNet/IP Network Configuration
EtherNet/IP Communication Modules
1756-ENBT, 1756-EN2F, 1756-EN2T, 1756-EN2TP, 1756-EN2TPK, 1756-EN2TPXT, 1756-EN2TR, 1756-EN2TRXT,
1756-EN2TSC, 1756-EN2TXT, 1756-EN3TR, 1756-EWEB, 1768-ENBT
CompactLogix 5370 Controllers
EtherNet/IP Adapters
1734-AENT, 1734-AENTR, 1769-AENTR, 1794-AENT, 20-COMM-E, 22-COMM-E, 20-750-ENETR
Embedded Switches
1783-ETAP, 1783-ETAP1F, 1783-ETAP2

Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to
familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws,
and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are
required to be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may
be impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from
the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or
liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or
software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation,
Inc., is prohibited
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous
environment, which may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property
damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT

Identifies information that is critical for successful application and understanding of the product.

Labels may also be on or inside the equipment to provide specific precautions.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous
voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may
reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to
potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL
Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Table of Contents
Preface

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9
9
9
9

Chapter 1
EtherNet/IP Overview

EtherNet/IP Communication Modules in a Control System . . . . . . 11

Chapter 2
Configure a Workstation to
Operate on an EtherNet/IP
Network
Configure an EtherNet/IP
Communication Module to
Operate on the Network

Configure the Ethernet Communication Driver in RSLinx Software 14

Chapter 3
Determine Network Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set the Network IP Address on a Module . . . . . . . . . . . . . . . . . . . . . . .
Set the Network IP Address with the Rotary Switches . . . . . . . .
Set the Network IP Address with the BOOTP/DHCP Server.
Set the Network IP Address with RSLinx Software or the
Programming Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset the Module IP Address to Factory Default Value . . . . . . .
Duplicate IP Address Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duplicate IP Address Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . .
IP Address Swapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DNS Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use EtherNet/IP Communication Modules in a
Logix5000 Controller Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Explicit Protected Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enter Explicit Protected Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exit Explicit Protected Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
More Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device Level Ring Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Redundancy Protocol Network . . . . . . . . . . . . . . . . . . . . . . . . .

17
18
19
20
23
27
27
28
28
29
30
30
32
32
32
33
33
34
36

Chapter 4
Control I/O

Set Up the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Add Distributed I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Add an I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Select a Communication Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Choosing a Direct or Rack-optimized Connection . . . . . . . . . . .
Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Select a Remote Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set the Requested Packet Interval (RPI) . . . . . . . . . . . . . . . . . . . . . . . . .
Access Distributed I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

41
42
43
45
45
49
50
51
52
3

Table of Contents

Chapter 5
Interlocking and Data Transfer
between Controllers

Set Up the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tag Guidelines for Produced or Consumed Data . . . . . . . . . . . . . . . .
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections for Produced and Consumed Tags . . . . . . . . . . . . . . . . .
Produce a Tag. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure the Produced Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consume Data Produced by Another Controller . . . . . . . . . . . . . . . .
Add the Producer Controller to the I/O Configuration of the
Consumer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Create the Consumed Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guidelines for Message (MSG) Instructions . . . . . . . . . . . . . . . . . . . . .
Connections for Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cache Message Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communicate with the Socket Object Via a MSG Instruction . . . .
Enter Message Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Add the EtherNet/IP Communication Module to the I/O
Configuration of the Local Controller. . . . . . . . . . . . . . . . . . . . . . .
Enter a Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure a MSG Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communicate with PLC-5 or SLC Controllers . . . . . . . . . . . . . . . . . .
Converting between INTs and DINTs . . . . . . . . . . . . . . . . . . . . . .
Mapping Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receive MSGs from PLC-5 or SLC 500 Controllers . . . . . . . . . .

56
57
57
57
59
59
61
61
63
66
67
67
67
68
68
70
71
75
75
76
78

Chapter 6
Send Email

EtherNet/IP Communication Module as an Email Client . . . . . . . .
Send Email Via a Controller-initiated Message Instruction. . . . . . . .
Create String Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enter the Ladder Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure the MSG Instruction that Identifies the
Mail Relay Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure the MSG Instruction that Contains the Email Text
Configure the Email Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enter Email Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Possible Email Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

79
81
81
84
84
86
88
94
94

Chapter 7
Communicate with PanelView
Terminals

4

Set Up the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Logix5000 Controller Combinations . . . . . . . . . . . . . . . . . . . . . . . 98
Connections to PanelView Terminals. . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Add a PanelView Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Organize Controller Data for a PanelView Terminal . . . . . . . . . . . . 103
Connections to FactoryTalk View Applications. . . . . . . . . . . . . . . . . 103

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Table of Contents

Chapter 8
Diagnostic Web Pages

Access Web Browser Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
1756-EN2TR Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Diagnostic Overview Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Ethernet Statistics Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Connection Manager Cmd Object Info Web Page . . . . . . . . . . 110
Ring Statistics Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
1756-ENBT Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Diagnostic Overview Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Ethernet Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
1756-EN2TP Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Diagnostic Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Ethernet Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
PRP Statistics Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
PRP Nodes Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
1769-AENTR Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Diagnostic Overview Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Ethernet Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Appendix A
1756 EtherNet/IP Status
Indicators

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

5

Table of Contents

Notes:

6

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Summary of Changes
This manual contains new and updated information as indicated in the
following table.
Topic

Page

Added content about how to change a module type but keep the definition.

30

Added Parallel Redundancy Protocol content.

36

Added the 1756-EN2TP PRP communication module to the Diagnostics chapter.

116

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

7

Summary of Changes

Notes:

8

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Preface

Purpose

This manual describes how you can use EtherNet/IP communication modules
with your Logix5000™ controller and communicate with various devices on the
Ethernet network.

Scope

Use this manual if you program applications that use EtherNet/IP networks
with these Logix5000 controllers:
• CompactLogix™ controller
• ControlLogix® controller
• SoftLogix™ controller

Conventions

Be sure to understand these concepts and tools:
• Use of networking
• Studio 5000 Logix Designer® application
• RSLinx® Classic software
• RSNetWorx™ for EtherNet/IP software

Additional Resources

These documents contain additional information concerning related products
from Rockwell Automation.

Resource

Description

EtherNet/IP Modules Installation Instructions,
publication ENET-IN002

Provides information about how to complete these tasks with EtherNet/IP communication modules in a
Logix5000 control system:
• Install the module
• Configure initial application setup
• Troubleshoot application anomalies related to EtherNet/IP communication module use

EtherNet/IP Media Planning and Installation Manual
This manual is available from the Open DeviceNet Vendor
Association (ODVA) at: http://www.odva.org.

Provides details about how to install, configure, and maintain linear and Device Level Ring (DLR) networks by
using Rockwell Automation® EtherNet/IP devices equipped with embedded switch technology.

EtherNet/IP Secure Communication User Manual,
publication ENET-UM003

Provides information on how to configure authentication, encryption, and firewalls, typical architectures, and
diagnostics for modules equipped with secure communication function.

Ethernet Design Considerations Reference Manual, publication
ENET-RM002

Provides details about how to use EtherNet/IP communication modules with Logix5000 controllers and
communicate with other devices on the EtherNet/IP network.

EtherNet/IP Socket Interface Application Technique, publication
ENET-AT002

Describes the socket interface that you can use to program MSG instructions. These instructions communicate
between a Logix5000 controller via an EtherNet/IP module and Ethernet devices that do not support the
EtherNet/IP application protocol. These include bar code scanners, RFID readers, or other standard Ethernet
devices.

EtherNet/IP Embedded Switch Technology Application Guide,
publication ENET-AP005

Provides details about how to install, configure, and maintain linear and Device Level Ring (DLR) networks by
using Rockwell Automation EtherNet/IP devices equipped with embedded switch technology.

Troubleshoot EtherNet/IP Networks Application Technique,
publication ENET-AT003

Provides details about how to assign IP addresses to and how to troubleshoot EtherNet/IP networks and
devices.

EtherNet/IP Parallel Redundancy Protocol (PRP) Application
Technique, publication ENET-AT006

Provides details about how to install, and configure a Parallel Redundancy Protocol (PRP) networks by using
Rockwell Automation EtherNet/IP devices equipped with embedded switch technology.

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

9

Preface

You can view or download publications at
http:/www.rockwellautomation.com/literature/. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or
Rockwell Automation sales representative.

10

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Chapter

1

EtherNet/IP Overview

EtherNet/IP networks are communication networks that offer a
comprehensive suite of messages and services for many automation
applications.
The following are examples of applications that use EtherNet/IP networks:
• Real-Time Control
• Time Synchronization
• Motion
This open network standard uses commonly available Ethernet
communication products to support real-time I/O messaging, information
exchange, and general messaging.
EtherNet/IP networks also support CIP Safety, which makes the simultaneous
transmission of safety and standard control data and diagnostics information
over a common network possible.

EtherNet/IP Communication
Modules in a Control System

Depending on the type, Rockwell Automation® EtherNet/IP communication
modules provide some of these functions:
• Support for messaging, produced/consumed tags, and distributed I/O
• Encapsulate messages within standard TCP/UDP/IP protocol
• Share a common application layer with ControlNet and DeviceNet
network protocols
• Interface via RJ45, category 5, unshielded, twisted-pair cable connectors
• Fiber connectors
• Support for half/full duplex 10 Mbps or 100 Mbps operation
• No network scheduling or routing table requirements

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

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Chapter 1

EtherNet/IP Overview

This graphic shows how Rockwell Automation EtherNet/IP communication
modules fit into a control system.
Figure 1 - EtherNet/IP Communication Modules in a Control Systems
Distributed I/O

A1+ A1-

04 12

B1+ B1-

05 13

Z1+ Z1-

06 14

+V +V
OUT OUT
0 2
OUT 0UT
1 3

NC NC

COM COM

03 11
04 12
05 13
06 14
07 15

COM COM
0
1
DC OUT

COM
COM

IN

IN

24VDC
SINK\
SOURCE

02 10

+24VDC
+24VDC

DC
INPUT

Z0+ Z0-

03 11

01 09

0
0
1

B0+ B0-

02 10

00 08

A0 B0 Z0
A0 B0 Z0
A1 B1 Z1
A1 B1 Z1

1

2 FUSE
2 FUSE
3 OK
3 OK

1768-L4x
1768-ENBT

HSC

A0+ A0-

01 09

COM COM
0 1

+V +V

00:00:BC:2E:69:F6

DC
INPUT

24VDC
SINK\
SOURCE

2
3 4 5 6
7
1
2
3 4 5 6
7
10 11 12 13 14 15
9 10 11 12 13 14 15
2
3 4 5 6
7
1
2
3 4 5 6
7
10 11 12 13 14 15
9 10 11 12 13 14 15

DC
OUTPUT

24VDC
SOURCE

1
0
9
8
1
0
9
8

DC IN

00 08

07 15

OUT
OUT

8

DC
OUTPUT

0
8

0

24VDC
SOURCE

L27ERM

QBFC1B

HIGH SPEED
HIGH SPEED
COUNTER
COUNTER

CompactLogix™ L2 Controller

V V
in in
0+ 2+
I
I
in in
0+ 2+
V/I V/I
in in
0- 2CJC inV
+ 3+
CJC inI
- 3+
V V/I
in in
1+ 3-

1756-EN2T
1756 I/O Modules

I V/I
in in
1+ 1V V
OUT OUT
0+ 1+
I I
OUT in
0+ 1+

COM COM
ANALOG

FG
FG

CompactLogix L3
Controller
Linear Topology

00:00:BC:2E:69:F6
1 (Front)
(Front)
2 (Rear)

Switch
1794-AENT
1794 I/O Modules

CompactLogix L1
Controller

1734-AENT
1734 I/O Modules

PowerFlex
® Drive

Workstation
1783-ETAP
Workstation

1783-ETAP
PanelView™ Terminal

1783-ETAP
PowerFlex® Drive

Comm Adapter

Device Level Ring Topology
For more information on using
EtherNet/IP communication
modules and taps in a DLR
network, see the EtherNet/IP
Embedded Switch Technology
Application Guide,
publication ENET-AP005.

1783-ETAP

MOD

LINK 1

NET

LINK 2

X 100

X 10

LINK 2

LINK 1

X1

1756-EN2TR
1756 I/O Modules

1734-AENTR
1734 I/O Modules

1738-AENTR
1738 I/O Modules

1769-AENTR
1769 I/O Modules

In this example, these actions can occur over the EtherNet/IP network:
• Controllers produce and consume tags.
• Controllers initiate MSG instructions that send and receive data or
configure devices.
• Workstations upload or download projects to the controllers

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Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Chapter

2

Configure a Workstation to Operate on an
EtherNet/IP Network

This chapter describes how to configure a workstation to operate on an
EtherNet/IP network.
You must configure an Ethernet communication driver in RSLinx® software for
the workstation.
A workstation needs the driver to perform these tasks:
• Upload and download the programming software project information
to controllers over an EtherNet/IP network.
• Configure EtherNet/IP network parameters for devices via
RSNetWorx™ for EtherNet/IP software.
• Collect controller data for electronic operator interfaces, for example,
PanelView™ Plus terminals, and visualization software, for example,
FactoryTalk® View software.
You can choose either of these Ethernet drivers:
• AB_ETHIP
• AB_ETH
Before you add a driver, confirm that these conditions exist:
• Workstation is properly connected to the EtherNet/IP network
• IP address and other network parameters are correctly configured for
the workstation

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

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Chapter 2

Configure a Workstation to Operate on an EtherNet/IP Network

Configure the Ethernet
Communication Driver in
RSLinx Software

To configure the EtherNet/IP driver, follow these steps.
1. From the Communications menu, choose Configure Drivers.

The Configure Drivers dialog box appears.
2. From the Available Driver Types pull-down menu, choose EtherNet/IP
Driver or Ethernet devices and click Add New.

The Add New RSLinx® Driver dialog box appears.

14

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Configure a Workstation to Operate on an EtherNet/IP Network

Chapter 2

3. Type a name for the new driver and click OK.

The Configure driver dialog box appears.
4. Click Browse Local Subnet.
TIP

To view devices on another subnet or VLAN from the workstation running
RSLinx software, click Browse Remote Subnet.

5. Click OK to close the dialog box.

This new driver is available.

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

15

Chapter 2

Configure a Workstation to Operate on an EtherNet/IP Network

Notes:

16

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Chapter

3

Configure an EtherNet/IP Communication
Module to Operate on the Network
This chapter describes how to configure an EtherNet/IP communication
module to operate on an EtherNet/IP network.

Determine Network
Parameters

Topic

Page

Determine Network Parameters

17

Set the Network IP Address on a Module

18

Duplicate IP Address Detection

27

IP Address Swapping

28

DNS Addressing

29

Use EtherNet/IP Communication Modules in a Logix5000 Controller Application

30

Change Type

30

Explicit Protected Mode

32

Electronic Keying

33

Device Level Ring Network

34

Parallel Redundancy Protocol Network

36

To operate an EtherNet/IP network, you must define these parameters.

EtherNet/IP Network Parameter

Description

IP address

The IP address uniquely identifies the module. The IP address is in the form xxx.xxx.xxx.xxx where each xxx is a number
from 000…254.
There are some reserved values that you cannot use as the first octet in the address. These numbers are examples
of values you cannot use:
• 001.xxx.xxx.xxx
• 127.xxx.xxx.xxx
• 223 to 255.xxx.xxx.xxx
The specific reserved values that cannot be used vary according to the conditions of each application. The previous
values are only examples of reserved values.

Subnet mask

Subnet addressing is an extension of the IP address scheme that allows a site to use one network ID for multiple
physical networks. Routing outside of the site continues by dividing the IP address into a net ID and a host ID via the
class. Inside a site, the subnet mask is used to redivide the IP address into a custom network ID portion and host ID
portion. This field is set to 0.0.0.0 by default.
If you change the subnet mask of an already-configured module, you must cycle power to the module for the change
to take effect.

Gateway

A gateway connects different subnets into a system of networks. When a node must communicate with a node on
another network, a gateway transfers the data between the two networks. This field is set to 0.0.0.0 by default.

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If you use DNS addressing, or reference the module via host name in MSG
instructions, define these parameters.
Table 1 - EtherNet/IP Network Parameters for DNS Addressing
EtherNet/IP Network Parameter

Description

Host name

A host name is part of a text address that identifies the host for a module. The full text address of a module is
host_name.domain_name.

Domain name

A domain name is part of a text address that identifies the domain in which the module resides. The full text address of a module is
host_name.domain_name. The domain name has a 48-character limit.
If you specify a DNS server, you must type a domain name. Also, if you send email from the module, some mail relay servers require a
domain name during the initial handshake of the SMTP session.

Primary DNS server address

This address identifies any DNS servers used in the network. You must have a DNS server that is configured if you specified a domain
name or a host name in the configuration of the module. The DNS server converts the domain name or host name to an IP address that
the network uses.
For more information on DNS addressing, see page 29.

Secondary DNS server address

Check with your Ethernet network administrator to determine if you must
specify these parameters.

Set the Network IP Address
on a Module

Depending on the EtherNet/IP communication module, you can use some or
all of these tools to set the network Internet Protocol (IP) address:
• Rotary switches - Switches are physical parts on the module. Remember
the following as you read this chapter:
– Some EtherNet/IP communication modules use thumbwheel
switches that function similarly to rotary switches. This chapter uses
the term rotary switches to describe both switch types.
– Some EtherNet/IP communication modules do not have rotary
switches. If your module does not have switches, skip Set the
Network IP Address with the Rotary Switches on page 19 and go to
Set the Network IP Address with the BOOTP/DHCP Server on
page 20.
– 1783-ETAPx EtherNet/IP taps use DIP switches to set the network
IP address. For more information on how to use the DIP switches, see
the publications for those products.
• Bootstrap Protocol (BOOTP)/Dynamic Host Configuration Protocol
(DHCP) server
• RSLinx® Classic software
• Programming software
The module uses these tools sequentially to set the IP address.

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EtherNet/IP communication modules are shipped with this configuration:
• BOOTP/DHCP enabled
• Rotary switches set to 999 - when applicable
If you must reset the settings of your module to its factory default settings
during normal module operation, see Reset the Module IP Address to Factory
Default Value on page 27.
The tools are used in this sequence to set the network IP address:
1. Set the Network IP Address with the Rotary Switches
2. Set the Network IP Address with the BOOTP/DHCP Server
3. Set the Network IP Address with RSLinx Software or the Programming
Software

Set the Network IP Address with the Rotary Switches
This graphic shows the rotary switches on a 1756 EtherNet/IP communication
module. The location of the switches is dependent on the module.

At powerup, the module reads the rotary switches to determine if they are set
to a valid number for the last portion of the IP address. Valid numbers range
from 001…254.
If the settings are a valid number, these conditions result:
• IP address = 192.168.1.xxx (where xxx represents the switch settings)
• Subnet mask = 255.255.255.0
• Gateway address = 0.0.0.0

TIP

Some modules now provide a gateway address of 192.168.1.1 when the
network address is set with rotary switches. See the product documentation
to determine the correct gateway address the module uses.

• The module does not have a host name that is assigned to it, nor does it
use any Domain Name System
We recommend that you set the rotary switches to a valid number before
installing the module.

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If either of these conditions exist, the module attempts to use the
BOOTP/DHCP server to set the IP address:
• Rotary switches are not set to a valid number
• Module does not have rotary switches
For more information on how to use the BOOTP/DHCP server to set the IP
address, see page 20.

Set the Network IP Address with the BOOTP/DHCP Server
The BOOTP/DHCP server is a standalone server that you can use to set an IP
address. When used, the BOOTP/DHCP server sets an IP address and other
Transport Control Protocol (TCP) parameters.
You can use the BOOTP/DHCP server to set the IP address of the module if
one of these conditions exists at powerup:
• The rotary switches of the module are not set to a number and the
module is BOOTP/DHCP enabled.
• The module does not have rotary switches and the module is
BOOTP/DHCP enabled.
Access the BOOTP/DHCP server from one of these locations:
• Programs > Rockwell Software > BOOTP-DHCP Server
If you have not installed the server, you can download and install it from
http://www.ab.com/networks/ethernet/bootp.html.
• Tools directory on the programming software installation CD
IMPORTANT

Before you start the BOOTP/DHCP server, make sure that you have
the hardware (MAC) address of the module. The hardware address is
on a sticker on the side of the communication module and uses an
address in a format similar to the following:
00-00-BC-14-55-35

To set the IP address of the module with a BOOTP/DHCP server, follow
these steps.

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1. Start the BOOTP/DHCP software.
2. From the Tools menu, choose Network Settings.

3. Type the Subnet Mask of the network.

The Gateway address, Primary and/or Secondary DNS address, and
Domain Name fields are optional.
4. Click OK.
The Request History panel appears with the hardware addresses of all
modules that issue BOOTP requests.
5. Select the appropriate module.

6. Click Add to Relation List.

The New Entry dialog box appears.

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7. Type an IP Address, Hostname, and Description for the module.

8. Click OK.
9. To assign this configuration to the module, wait for the module to
appear in the Relation List panel and select it.
10. Click Disable BOOTP/DHCP.

When power is recycled, the module uses the assigned configuration and
does not issue a BOOTP request.
IMPORTANT

If you do not click Disable BOOTP/DHCP, on a power cycle, the host
controller clears the current IP configuration and begins sending
BOOTP requests again.

Use DHCP Software
Dynamic Host Configuration Protocol (DHCP) software automatically
assigns IP addresses to client stations logging on to a TCP/IP network. DHCP
is based on BOOTP and maintains some backward compatibility. The main
difference is that BOOTP allows for manual configuration (static), while
DHCP allows for both static and dynamic allocation of network addresses and
configurations to newly attached modules.
Be cautious when using DHCP software to configure a module. A BOOTP
client, such as the EtherNet/IP communication modules, can start from a
DHCP server only if the DHCP server is written to handle BOOTP queries.
This situation is specific to the DHCP software package used. Consult your
system administrator to see if a DHCP package supports BOOTP commands
and manual IP allocation.
ATTENTION: The EtherNet/IP communication module must be assigned a
fixed network address. The IP address of this module must not be
dynamically provided.
Failure to observe this precaution may result in unintended machine motion or
loss of process control.

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Set the Network IP Address with RSLinx Software or the
Programming Software
This table describes when to set the network IP address with RSLinx software
or programming software.
Conditions

Software to Use

Page

• A BOOTP server is not available
• The EtherNet/IP communication module is connected to another
NetLinx network

RSLinx software

24

The programming software project is online with a controller that
communicates to or through the EtherNet/IP communication module

Studio 5000 Logix
Designer® application

26

Consider these factors when you determine how to set the network IP address:
• Network isolation from or integration into the plant/enterprise network
• Network size - For large networks, isolated networks, it can be more
convenient and safer to use a BOOTP/DHCP server rather than the
programming software or RSLinx software. The BOOTP/DHCP
server also limits the possibility of assigning duplicate IP addresses.
• Company policies and procedures that deal with plant floor network
installation and maintenance
• Level of involvement by IT personnel in plant-floor network installation
and maintenance
• Type of training that is offered to control engineers and maintenance
personnel
A module can get an address from the enterprise server before the Rockwell
Automation® utility even sees the module. This situation can occur when you
use the Rockwell Automation BOOTP or DHCP server in an uplinked subnet
where an enterprise DHCP server exists. You have to disconnect from the
uplink to set the address and configure the module to retain its static address
before reconnecting to the uplink. This possibility is not a problem if you have
node names that are configured in the module and leave DHCP enabled.

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Set the Network IP Address with RSLinx Software
To use RSLinx software to set the IP address of the communication module,
follow these steps.
1. From the Communications menu, choose RSWho.
The RSWho dialog box appears.
2. Navigate to the Ethernet network.
3. Right-click the EtherNet/IP module and choose Module
Configuration.

The Module Configuration dialog box appears.
4. Click the Port Configuration tab.

5. For Network Configuration Type, click Static to assign this
configuration to the port.
IMPORTANT

24

If you click Dynamic, on a power cycle, the controller clears the current
IP configuration and resumes sending BOOTP requests.

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6. Type this information in the appropriate fields:
• In the IP Address field, type the IP address.
• In the Network Mask field, type the network mask address.
• In the Gateway Address field, type the gateway address.
• In the Primary Name Server field, type the name of the primary
server.
• In the Secondary Name Server field, type the name of the secondary
server.
• In the Domain Name field, type the domain name.
• In the Host Name field, type the host name.
7. Configure the port settings.
To

Then

Use the default port speed and
duplex settings

Leave Auto-negotiate port speed and duplex checked.
This setting determines the actual speed and duplex setting.

Manually configure the speed and
duplex settings for your port

Follow these steps.
1. Clear the Auto-negotiate port speed and duplex checkbox.
2. From the Current Port Speed pull-down menu, choose a port
speed.
3. From the Current Duplex pull-down menu, choose the
appropriate Duplex value, that is, Half Duplex or Full Duplex.

IMPORTANT

Consider the following when you configure the port settings for the
module:
• The speed and duplex settings for the devices on the same
Ethernet cable must be the same to avoid transmission errors.
• Fixed speed and full-duplex settings are more reliable than
autonegotiate settings and are recommended for some
applications.
• If the module is connected to an unmanaged switch, leave
Autonegotiate port speed and duplex checked or
communication can be impaired.
• If you force the port speed and duplex with a managed switch,
the corresponding port of the managed switch must be forced to
the same settings or the module fails.
• If you force the port speed and duplex, and the other device is
configured for autonegotiate, a high rate of transmission errors
can occur.

8. Click OK.

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Set the Network IP Address with the Programming Software
To use programming software to set the IP address of the communication
module, follow these steps.
1. In the Controller Organizer, right-click the EtherNet/IP module and
choose Properties.

The Module Properties dialog box appears.
2. Click the Port Configuration tab.

3. In the IP Address field, type the IP address.
4. In the other fields, type the other network parameters, if needed.
IMPORTANT

The fields that appear vary from one EtherNet/IP module to
another.

5. Click Set.
6. Click OK.

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Reset the Module IP Address to Factory Default Value
You can reset the IP address of the module to its factory default value with the
following methods:
• If the module has rotary switches, set the switches to 888 and cycle
power.
• If the module does not have rotary switches, use a MSG instruction to
the reset the IP address.

Duplicate IP Address
Detection

Some EtherNet/IP communication modules support duplicate IP
address detection. The module verifies that its IP address does not match the
IP address of any other network device when you perform either of these tasks:
• Connect the module to a EtherNet/IP network.
• Change the IP address of the module.
If the IP address of the module matches that of another device on the network,
the EtherNet/IP port of the module transitions to Conflict mode. In Conflict
mode, these conditions exist:
• OK status indicator is blinking red.
• Network (NET) status indicator is solid red.
• On some EtherNet/IP communication modules, the module status
display indicates the conflict.
The display scrolls:OK  Duplicate IP

For example: OK 10.88.60.196 Duplicate IP - 00:00:BC:02:34:B4
• On some EtherNet/IP communication modules, the diagnostic
webpage for the module displays information about duplicate IP address
detection.
For more information on which EtherNet/IP communication modules
support displaying duplicate IP address on their diagnostic webpage, see
the Technical Note titled Logix modules Duplicate IP address
detection enhancement, #118216, in the Technical Support
Knowledgebase available at
http://www.rockwellautomation.com/knowledgebase/.

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Duplicate IP Address Resolution
When two EtherNet/IP communication modules on a network have IP
addresses that conflict, the resolution depends on the conditions in which the
duplication is detected. This table describes how duplicate IP addresses are
resolved.
Duplicate IP Address Detection Conditions

Resolution Process

• Both modules support duplicate IP address detection
• Second module is added to the network after the first
module is operating on the network

1. The module that began operation first uses the IP address and continues to operate without interruption.
2. The module that begins operation second detects the duplication and enters Conflict mode.
To assign a new IP address to the module and leave Conflict mode, see Set the Network IP Address on a Module
on page 18.

• Both modules support duplicate IP address detection
• Both modules were powered up at approximately the
same time

Both EtherNet/IP devices enter Conflict mode.
To resolve this conflict, follow these steps:
a. Assign a new IP address to one of the modules by using the methods described in Set the Network IP
Address on a Module on page 18.
b. Cycle power to the other module.

One module supports duplicate IP address detection and a
second module does not

1. Regardless of which module obtained the IP address first the module that does not support IP address
detection uses the IP address and continues to operate without interruption.
2. The module that supports duplicate IP address detection detects the duplication and enters Conflict mode.
To assign a new IP address to the module and leave Conflict mode, see Set the Network IP Address on a Module
on page 18.

Devices that experience duplicate IP address conditions behave differently
depending on whether connections have been established to either of the
modules and whether both modules support duplicate IP address detection.

IP Address Swapping

Some EtherNet/IP communication modules support IP address swapping.
This function is used in ControlLogix® enhanced redundancy systems. During
a system switchover, partnered EtherNet/IP communication modules swap IP
addresses.
For more information about IP address swapping, see the ControlLogix
Enhanced Redundancy System User Manual, publication 1756-UM535.

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DNS Addressing

Chapter 3

To qualify the address of a module, use DNS addressing to specify a host name
for a module, which also includes specifying a domain name and DNS servers.
DNS addressing makes it possible to configure similar network structures and
IP address sequences under different domains.
DNS addressing is necessary only if you refer to the module by host name, such
as in path descriptions in MSG instructions.
To use DNS addressing, follow these steps.
1. Assign a host name to the module.
A network administrator can assign a host name. Valid host names must
be IEC-1131-3 compliant.
2. Configure the parameters of the module.
3. Configure the IP address, subnet mask, gateway address, a host name for
the module, domain name, and primary/secondary DNS server
addresses.
In the DNS server, the host name must match the IP address of the
module.
IMPORTANT

Make sure the DNS enable bit is set.
If you configure your module by using RSLinx software, version
2.41, the enable bit is cleared and DNS addressing does not work. If
you configure your module by using the Port Configuration tab in
the programming software, the enable bit is set, so DNS addressing
works.

4. In the programming software, add the module to the I/O configuration
tree.
See Add an I/O Module on page 43.
IMPORTANT

If a child module resides in the same domain as its parent
module, type the host name. If the child domain of the child
module differs from the domain of its parent module, type the
host name and the domain name (host.domain)

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IMPORTANT

Use EtherNet/IP
Communication Modules in a
Logix5000 Controller
Application

You can also use DNS addressing in a module profile in the I/O
controller tree or in a message path. If the domain name of the
destination module differs from that of the source module, use a
fully qualified DNS name (hostname.domainname). For
example, to send a message from ENBT1.location1.companyA to
ENTB1.location2.companyA, the host names match, but the
domains differ. Without the entry of a fully qualified DNS name,
the module adds the default domain name to the specified host
name.

After installing an EtherNet/IP communication module and setting its IP
address, add the module to the Controller Organizer in a programming
software project. This addition establishes I/O control.
You must download that project to the host controller before operation can
begin. When the controller begins operation, it establishes a connection with
the EtherNet/IP communication module. The configuration of the module
determines its behavior.
For more information on how to connect a workstation to and configure it for
use on an EtherNet/IP network, see Configure a Workstation to Operate on an
EtherNet/IP Network on page 13.
For more information on controlling I/O, see Control I/O on page 41.

Change Type
Use the Change Type dialog box to change your bridge module type to another
bridge module type or revision. For example, you can change a 1756-EN2TR
Ethernet Bridge module to a 1756-EN2TP Ethernet Bridge module, keeping
the module definitions.

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Use the Change Type function on the Module Properties dialog box to change
the module type without having to create a new module definition.

Follow these steps to change one module definition to another module type.
1. Right-click on the module in the Controller Organizer.
2. Click Properties.
3. Click Change Type.

4. Select the Change module to type:
5. Click OK.
The previous module definition properties apply to the new module you
selected. Unless you have copied the module in the Controller
Organizer, the module you changed from is now gone.

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Explicit Protected Mode

When in this mode, the module does not allow any configuration changes.

Enter Explicit Protected Mode
Follow these steps to enter Explicit Protected Mode (Italics are where the
entry/exit procedures are different).
1. Remove the module from the chassis and record the positions of the
rotary switches.
2. Set the rotary switches to: 900
3. Insert the module into the chassis.
4. Observe on the display.
Explicit protected mode enabled - Change Switch Settings
The module is non-operational at this point. You must continue with
step 5 to re-establish operation.
5. Remove the module from the chassis
6. Return the rotary switches to the positions they were in before step 2.
7. Insert the module in the chassis.
The module is operational, and does not allow any configuration
changes.

Exit Explicit Protected Mode
Follow these steps to exit Explicit Protected Mode.
1. Remove the module from the chassis and record the positions of the
rotary switches.
2. Set the rotary switches to: 000
3. Insert the module into the chassis.
4. Observe on the display.
Explicit protected mode disabled - Change Switch Settings
The module is non-operational at this point. You must continue with
step 5 to re-establish operation.
5. Remove the module from the chassis.
6. Return the rotary switches to the positions they were in before step 2.
7. Insert the module in the chassis.
The module is operational, and allows configuration changes.
TIP Another option is to do an out of box reset using the rotary
switches, as described in Set the Network IP Address with the
Rotary Switches on page 19.

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Electronic Keying

Chapter 3

Electronic Keying reduces the possibility that you use the wrong device in a
control system. It compares the device defined in your project to the installed
device. If keying fails, a fault occurs. These attributes are compared.
Attribute

Description

Vendor

The device manufacturer.

Device Type

The general type of the product, for example, digital I/O module.

Product Code

The specific type of the product. The Product Code maps to a catalog number.

Major Revision

A number that represents the functional capabilities of a device.

Minor Revision

A number that represents behavior changes in the device.

The following Electronic Keying options are available.
Keying Option

Description

Compatible
Module

Lets the installed device accept the key of the device that is defined in the project when the
installed device can emulate the defined device. With Compatible Module, you can typically
replace a device with another device that has the following characteristics:
• Same catalog number
• Same or higher Major Revision
• Minor Revision as follows:
– If the Major Revision is the same, the Minor Revision must be the same or higher.
– If the Major Revision is higher, the Minor Revision can be any number.

Disable Keying

Indicates that the keying attributes are not considered when attempting to communicate with
a device. With Disable Keying, communication can occur with a device other than the type
specified in the project.
ATTENTION: Be extremely cautious when using Disable Keying; if used incorrectly, this option
can lead to personal injury or death, property damage, or economic loss.
We strongly recommend that you do not use Disable Keying.
If you use Disable Keying, you must take full responsibility for understanding whether the
device being used can fulfill the functional requirements of the application.

Exact Match

Indicates that all keying attributes must match to establish communication. If any attribute
does not match precisely, communication with the device does not occur.

Carefully consider the implications of each keying option when selecting one.
IMPORTANT

Changing Electronic Keying parameters online interrupts connections to the device
and any devices that are connected through the device. Connections from other
controllers can also be broken.
If an I/O connection to a device is interrupted, the result can be a loss of data.

More Information
For more detailed information on Electronic Keying, see Electronic Keying in
Logix5000™ Control Systems Application Technique,
publication LOGIX-AT001.

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A Device Level Ring (DLR) network is a single-fault-tolerant ring network
intended for the interconnection of automation devices without the need for
additional switches. The ring topology offers these advantages:
• Media redundancy
• Fast network fault detection and reconfiguration
• Resiliency of a single-fault-tolerant network
• Easy implementation without additional hardware requirements

Device Level Ring Network

IMPORTANT

This section summarizes a DLR network. For information on planning,
configuring, and monitoring DLR networks, see EtherNet/IP Embedded
Switch Technology Application Guide, publication ENET-AP005.

One DLR network can support as many as 50 nodes. A DLR network supports
copper connections (maximum of 100 m), fiber-optic connections (maximum
of 2 km), or a mix of copper and fiber.
Figure 2 - Example Device Level Ring Topology
1783-ETAP

1756-EN2TR

1783-ETAP

1783-ETAP

1756-EN2TR
1756 I/O Modules

1734-AENTR
1734 I/O Modules

1738-AENTR
1738 I/O Modules

1769-AENTR
1769 I/O Modules

Check your device specifications to determine whether the device supports the
DLR network and whether the device can act as a supervisor.
A DLR network consists of the following nodes.

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Node

Description

Supervisor Node

A DLR network requires at least one node to be configured as ring supervisor.
Important: Out-of-the-box, the supervisor function of the supervisor-capable devices is disabled so they are ready to
participate in a linear/star network or as a ring node on a DLR network.
In a DLR network, you must configure at least one of the supervisor-capable devices as the ring supervisor before
physically connecting the ring. If you do not, the DLR network does not work.
The ring supervisor provides these main functions:
• Manages traffic on the DLR network
• Collects diagnostic information for the network
We recommend that you do the following:
• Configure at least one back-up supervisor.
• Configure the desired active ring supervisor with a numerically higher precedence value as compared to the back-up
supervisors.
• Record the supervisor-precedence values of the DLR network for all supervisor-enabled nodes.

Ring Node

A ring node is any node that operates on the network to process data that is transmitted over the network. A ring node is
also any node that passes on the data to the next node on the network. When a fault occurs on the DLR network, the ring
nodes reconfigure themselves and relearn the network topology. Additionally, ring nodes can report fault locations to the
active ring supervisor.

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Parallel Redundancy
Protocol Network

A Parallel Redundancy Protocol (PRP) network offers a higher level of
redundancy than DLR. PRP is an international standard that is described in
IEC 62439-3. PRP technology builds network redundancy into the end
devices so that network infrastructure can be duplicated using standard
components, such as managed and unmanaged switches.
Table 2 describes terms to know when you configure PRP.
Table 2 - PRP Terms

36

Term

Description

Doubly or Dually Attached Node,
which implements PRP (DAN)

End-device with PRP functionality that is connected to each of the two
independent LANs.

Single Attached Node (SAN)

Device with one network interface that is connected directly to one of the two
LANs.

Redundancy Box (RedBox)

Device that connects one or more SANs to both LANs. The switch implements
RedBox functionality.

Virtual DAN (VDAN)

A SAN connected to both LANs through a RedBox. A node behind a RedBox
appears to other nodes as a DAN.

Hot Standby Router Protocol
(HSRP)

HSRP is one way to achieve near-100 percent network uptime. HSRP provides
network redundancy for IP networks, ensuring that user traffic immediately and
transparently recovers from first hop failures in network edge devices or access
circuits.

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Configure an EtherNet/IP Communication Module to Operate on the Network

Chapter 3

Figure 3 illustrates the simplest design of the PRP network topology. This
topology is the same as a star network configuration, but adds PRP
functionality by adding a separate, second LAN and replacing the end nodes
with PRP devices.
Figure 3 - Parallel Redundancy Protocol (PRP) Topology
1756-EN2TP, PRP Communication Module, Doubly Attached Node (DAN)
DC OUTPUT

DC INPUT

DIAG

DIAG

1756-EN2TP Module

LAN A (Blue)

LAN B (Green)

Stratix Switch
LAN A

Stratix Switch
LAN B

LAN A
LAN B
DC INPUT

DC OUTPUT

LAN B

LAN A

LAN A

DIAG

LAN B

DIAG

DC INPUT

DC OUTPUT
DIAG

DIAG

DC INPUT

DC OUTPUT
DIAG

DIAG

DAN
DAN
DAN

1756-EN2TP, PRP Communication Modules as adapters. Doubly Attached Node (DAN)

PRP provides a redundant network infrastructure. An important feature of
PRP is that the two LANs do not meet, but connect at the PRP end nodes. An
end node that is connected to both LANs is called Doubly or Dually Attached
Node or DAN. Both terms are fully accepted and used in the IEC standard.
WARNING: Never connect LAN A and LAN B directly to each other. For
example, never connect an infrastructure switch in LAN A to an infrastructure
switch in LAN B.

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Configure an EtherNet/IP Communication Module to Operate on the Network

Figure 4 illustrates the addition of a Redundancy Box, or RedBox. The RedBox
allows non-PRP devices to be added to both LANs. Devices that are connected
to both LANs through a RedBox are called Virtual Doubly Attached Nodes, or
VDANs.
VDANs do not have media redundancy between the device and the RedBox,
however, media redundancy exists on the LAN A/LAN B side of the RedBox.
In this example, the Stratix® 5400 switch is configured as a RedBox.
Figure 4 - Parallel Redundancy Protocol (PRP) Topology, with a Stratix 5400 as a RedBox
POINT I/O VDAN
1756-EN2TP, PRP Communication Module
Doubly Attached Node (DAN)

Module
Status
Network
Activity

Stratix 5400 configured as a RedBox

Network
Status
Point Bus
Status

1734-AENT
System
Power
Field
Power

DC OUTPUT

DC INPUT

SD CARD

DIAG

DIAG

LAN A

LAN B
HMI
VDAN
LAN A

Drive
VDAN

LAN B

SAN
SAN

LAN A

LAN B

LAN A
LAN B
DC INPUT

DAN

DC INPUT

DC OUTPUT

DIAG

DIAG

DIAG

DAN

DC INPUT

DC OUTPUT

DIAG

IMPORTANT

38

LAN A

LAN B

DC OUTPUT
DIAG

DIAG

DAN

Products with PRP technology have two ports. Each port connects to a
separate PRP LAN that then connects to two independent sets of network
infrastructures.
You cannot use these ports as two Network Interface Cards (NICs) connected
to two different subnets. Each 1756-EN2TP module has only 1 unique MAC
and has only one IP address.
The 1756-EN2TP Ethernet Communication module cannot be used as part of
a DLR ring, because the 1756-EN2TP supports PRP but not the DLR protocol.

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Configure an EtherNet/IP Communication Module to Operate on the Network

Chapter 3

For more information on PRP topologies and configuration scenarios, see the
EtherNet/IP Parallel Redundancy Protocol Application Technique,
publication ENET-AT006.
For more information on how to configure the Stratix switches for PRP see the
Stratix Managed Switches User Manual 1783-UM007.

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Configure an EtherNet/IP Communication Module to Operate on the Network

Notes:

40

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Chapter

4

Control I/O

This chapter describes how a controller controls distributed I/O over an
EtherNet/IP network. An EtherNet/IP communication module connects the
controller to the network.

Set Up the Hardware

Topic

Page

Set Up the Hardware

41

Add Distributed I/O

42

Select a Communication Format

45

Set the Requested Packet Interval (RPI)

51

Access Distributed I/O

52

In this example, the Logix5000™ controller uses an EtherNet/IP
communication module to connect to the EtherNet/IP network. The
distributed (remote) I/O uses an EtherNet/IP adapter to connect to the
EtherNet/IP network.
Figure 5 - Distributed I/O over an EtherNet/IP Network
Redundancy Module

Logix5575

EtherNet/IP

EtherNet/IP

ControlNet

EtherNet/IP

ControlNet

10/100 BASE T

RUN FORCE SD

Local Chassis with
Logix5000 Controller

OK

PRI COM OK

LNK NET OK

LNK1 LNK2 OK

LNK NET OK

REM PR
OG
RUN

1

Data

2

Remote Chassis with
EtherNet/IP Adapter and
I/O Modules

EtherNet/IP Switch

Workstation

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Chapter 4

Control I/O

A Logix5000 controller establishes direct or rack-optimized connections to
communicate with I/O modules. Digital I/O modules support either
connection type, but analog I/O modules support only direct connections.
You must complete these tasks before your controller can communicate with
distributed I/O modules over an EtherNet/IP network:
• Set the IP addresses for each EtherNet/IP communication module.
• Connect all wiring and cabling.
• Configure a communication driver (such as AB-ETHIP-1) for the
programming workstation.

Add Distributed I/O

To communicate with distributed I/O modules, add the following components
to the I/O Configuration folder of the controller:
• Local EtherNet/IP communication module
• Remote adapter
• I/O modules in the same chassis as the remote adapter
Within the folder, organize the modules into a hierarchy (tree/branch, parent/
child).
This graphic shows a system that uses a 1756-EN2TR module as the local
communication module, a remote 1794-AENT adapter and distributed
FLEX™ I/O modules.
Local Communication
Module

Controller
EtherNet/IP

Logix5575

ControlNet

EtherNet/IP

10/100 BASE T

RUN FORCE SD

OK

LNK1 LNK2 OK

10/100 BASE T

Remote Adapter and I/O Modules

LNK1 LNK2 OK

REM PR
OG
RUN

1

2

1

2

Device

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Control I/O

Chapter 4

To build the I/O configuration for a typical distributed I/O network, follow
these steps.
1. Add the local communication module, that is, the bridge.
2. Add the remote adapter for the distributed I/O chassis or DIN rail.
3. Add the I/O module.
This graphic shows the I/O configuration of the consumer controller after
distributed I/O modules are added.

IMPORTANT

I/O is controlled on the same subnet and cannot be processed via a
router.

Add an I/O Module
To add a module to the I/O Configuration folder, follow these steps.
1. In the Controller Organizer, right-click the remote communication
module and choose New Module.

The Select Module dialog box appears.

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Chapter 4

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2. Choose the module that you wish to add and click OK.

Depending on the I/O module, the Select Major Revision dialog box
can appear. If the dialog box appears, choose the major revision of the
module and click OK.
The Module Properties dialog box appears.

3. In the Name field, type the name of your I/O module.
4. In the Slot field, type the slot number in which your I/O module resides.
5. From the Comm Format pull-down menu, choose a communication
format.
For more information on the selection of communication formats, see
Set the Requested Packet Interval (RPI) on page 51.
6. Click OK to see the rest of the Module Properties dialog box.
7. Configure the module as necessary.
Use the Help button to view module-specific configuration
information.
8. Click Finish.

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Control I/O

Select a Communication
Format

Chapter 4

When configuring an I/O module, you must select a communication format.
The type of communication format determines the data structure for the tags
of the module. Many I/O modules support different formats. Each format uses
another data structure.
The communication format determines these parameters:
• Direct or rack-optimized connection
• Ownership
Table 3 - Communication Formats
I/O Module
Type

Desired Connection Type

Required Communication Format

Digital

A rack-optimized connection

Rack Optimization

To use specialty features of the module,
such as diagnostics, time stamps, or
electronic fuses

Full Diagnostics

A direct connection

Scheduled Data

Digital

CST Timestamped

Input Data
Output Data
Analog

A direct connection
(only direct connection is supported for
analog modules)

Float Data
Integer Data
CST Timestamped

See the programming software online help for specific communication formats
per I/O module.

Choosing a Direct or Rack-optimized Connection
The Logix5000 controller uses connections to transmit I/O data. These
connections can be direct connections or rack-optimized connections. The
connection types that are available are module-dependant.
Term

Definition

Direct
connection

A direct connection is a real-time, data transfer link between the controller and an I/O module.
The controller maintains and monitors the connection with the I/O module. Any break in the
connection, such as a module fault or the removal of a module while under power, sets fault bits
in the data area associated with the module.

A direct connection
is any connection
that does not use
the Rack
Optimization
Comm Format.

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Chapter 4

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Term

Definition

Rackoptimized
connection

For digital I/O modules, you can choose rack-optimized communication. A rack-optimized
connection consolidates connection usage between the controller and all digital I/O modules in
the chassis (or DIN rail). Rather than having individual, direct connections for each I/O module,
there is one connection for the entire chassis (or DIN rail).

Rack-optimized
connection

IMPORTANT

46

If you must use a rack-optimized communication format with a remote
1756 chassis, you cannot install different 1756 EtherNet/IP
communication modules in the same remote chassis. For example, you
cannot install a 1756-ENBT module and a 1756-EN2T module in the
same remote chassis if you format with a rack-optimized connection.

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Control I/O

Chapter 4

Direct Connections For I/O Modules
In this example, assume that each distributed I/O module is configured for a
direct connection to the controller.
Controller with EtherNet/IP
Communication Module
EtherNet/IP

Logix5575

EtherNet/IP

ControlNet

10/100 BASE T

RUN FORCE SD

OK

10/100 BASE T

LNK1 LNK2 OK

LNK1 LNK2 OK

REM PR
OG
RUN

EtherNet/IP Network
1

2

1

2

Switch

EtherNet/IP
10/100 BASE T

EtherNet/IP Adapters with I/O
Modules

LNK1 LNK2 OK

1

Two Digital I/O Modules

DC OUTPUT

ST
AT
ST
AT

Diagnostic

DC OUTPUT

ST
AT
ST
AT

Diagnostic

DC OUTPUT

ST
AT
ST
AT

Diagnostic

2

Three Analog I/O Modules

Four Digital I/O
Modules

Table 4 - Example - System Connections
System Connections

Amount

Controller to local EtherNet/IP communication module

0

Controller to EtherNet/IP adapter
Direct connection for digital I/O modules
Direct connection for analog I/O modules

6
3
Total connections used 9

If you have many modules, direct connections to each module cannot be
feasible because you could use up the number of connections and packets per
second supported by the module.
See Rack-optimized Connections for I/O Modules on page 48 to conserve
connection use and network traffic.

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Rack-optimized Connections for I/O Modules
In this example, assume that each digital I/O module is configured for a rackoptimized connection to the controller. Analog modules must be configured
for direct connections.
Controller with EtherNet/IP
Communication Module
EtherNet/IP

Logix5575

EtherNet/IP

ControlNet

10/100 BASE T

RUN FORCE SD

RUN

OK

10/100 BASE T

LNK1 LNK2 OK

LNK1 LNK2 OK

REM PR
OG

EtherNet/IP Network
1

2

1

2

Switch

EtherNet/IP
10/100 BASE T

LNK1 LNK2 OK

DC OUTPUT

ST
AT
ST
AT

Diagnostic

DC OUTPUT

ST
AT
ST
AT

Diagnostic

DC OUTPUT

ST
AT
ST
AT

Diagnostic

EtherNet/IP Adapters with I/
O Modules
1

Two Digital I/O Modules

2

Three Analog I/O Modules

Four Digital I/O
Modules

Table 5 - Example - System Connections
System Connections

Amount

Controller to local EtherNet/IP communication module

0

Controller to EtherNet/IP adapter with digital modules
(rack-optimized connection to each adapter)

2

Controller to EtherNet/IP adapter with analog modules
(direct connection for each analog I/O module)

3

Total connections used 5

The rack-optimized connection conserves connections, but can limit the status
and diagnostic information that is available from the I/O modules.
Use a rack-optimized connection between any digital I/O that allows it and the
remote adapter that connects the distributed I/O to the controller via the
communication module. This configuration optimizes the number of available
connections.

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Control I/O

Chapter 4

Ownership
In a Logix5000 system, modules multicast data. Therefore, multiple modules
can receive the same data simultaneously from one module. When choosing a
communication format, decide whether to establish an owner-controller or
listen-only relationship with the module.
Ownership Type

Description

Owner controller

The controller that creates the primary configuration and communication connection to a module. The owner controller writes configuration
data and can establish a connection to the module.

An owner connection is any connection that
excludes Listen-Only in its Comm Format.

Listen-only connection

An I/O connection where another controller owns/provides the configuration data for the I/O module. A controller that uses a listen-only
connection monitors only the module. It does not write configuration data and can only maintain a connection to the I/O module when the
owner controller is actively controlling the I/O module.

Listen-only connection

Table 6 - Choosing a Type of Module Ownership
Module Type

Another Controller

Input module

Does not own the module
Owns the module

Output module

Desired Conditions

Use This Connection Type
Owner

Maintain communication with the module if it loses
communication with the other controller

Owner

Stop communication with the module if it loses
communication with the other controller

Listen-only

Use the same configuration as the other owner
controller.

Does not own the module

Owner

Owns the module

Listen-only

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Table 7 - Input and Output Modules - Differences in Ownership
Control

This Ownership

Description

Input modules

Owner

A controller that establishes a connection as an owner configures an input module. This configuring controller is the first controller
to establish an owner connection.
Once a controller configures and owns an input module, other controllers can establish owner connections to that module. This
process allows additional owners to continue to receive multicast data if the original owner controller breaks its connection to the
module. Additional owners must have the identical configuration data and communication format as the original owner controller;
otherwise, the connection attempt is rejected.

Listen-only

Once a controller configures and owns an input module, other controllers can establish a listen-only connection to that module.
These controllers can receive multicast data while another controller owns the module. If all owner controllers break their
connections to the input module, all controllers with listen-only connections no longer receive multicast data.

Owner

A controller that establishes a connection as an owner configures an output module. Only one owner connection is allowed for an
output module. If another controller attempts to establish an owner connection, the connection attempt is rejected.

Listen-only

Once one controller configures and owns an output module, other controllers must establish listen-only connections to that
module. These controllers can receive multicast data while another controller owns the module. If the owner controller breaks its
connection to the output module, all controllers with listen-only connections no longer receive multicast data.

Output modules

Select a Remote Adapter
The type of distributed I/O modules that you must access determines which
adapter to use.
Table 8 - Choice of Remote Adapter

50

Type of Distributed I/O

Available Remote Adapters

1756 ControlLogix® I/O

1756-ENBT, 1756-EN2T, 1756-EN2TP, 1756-EN2TPK, 1756-EN2TPXT,
1756-EN2TR, 1756-EN2TRXT, 1756-EN2TXT, 1756-EN2F, or 1756-EN3TR
communication module

1794 FLEX™ I/O

1794-AENT

1734 POINT I/O™

1734-AENT

1769 Compact I/O™

1769-AENTR

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Control I/O

Set the Requested Packet
Interval (RPI)

Chapter 4

When you configure an I/O module, you define the requested packet interval
(RPI) for the module. Only data-producing modules require an RPI. For
example, a local EtherNet/IP communication module requires no RPI because
it produces no data for the system. Instead it functions only as a bridge.
To set an RPI, follow these steps.
1. Make sure that the module is installed, started, and connected to the
controller via a serial, or other network, connection.
2. In the Controller Organizer, right-click the EtherNet/IP
communication module and choose Properties.

The Module Properties dialog box appears.

3. Click the Connection tab.

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Chapter 4

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4. From the Requested Packet Interval (RPI) menu, enter the rate at which
you want data to be updated over a connection.
Only set the RPI to the rate the application requires.
IMPORTANT

The RPI determines the number of packets per second that the
module produces on a connection. Each module can produce only
a limited number of packets per second. If you exceed this limit it
prevents the module from opening more connections.

5. Click OK.
Unlike EtherNet/IP communication modules, in Logix5000 controllers, I/O
values update at an interval set via the I/O configuration folder for the project.
The values update asynchronously to the execution of logic. At the specified
interval, the controller updates a value independently from the execution of
logic.

I/O information is presented as a structure of multiple fields, which depends
on the specific features of the I/O module. The name of the structure is based
on the location of the I/O module in the system. Each I/O tag is automatically
created when you configure the I/O module through the programming
software.

Access Distributed I/O

Each tag name follows this format:
Location:SlotNumber:Type.MemberName.SubMemberName.Bit
This address variable

Is

Location

Identifies network location
LOCAL = local DIN rail or chassis
ADAPTER_NAME = identifies remote adapter or bridge

SlotNumber

Slot number of I/O module in its chassis

Type

Type of data
I = input
O = output
C = configuration
S = status

MemberName

Specific data from the I/O module, which depends on the type of data the module can store
For example, Data and Fault are possible fields of data for an I/O module. Data is the common name for values the are sent to or received
from I/O points.

SubMemberName

Specific data related to a MemberName

Bit (optional)

Specific point on the I/O module, which depends on the size of the I/O module (0...31 for a 32-point module)

52

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Control I/O

Chapter 4

EXAMPLE

1
2
3
4

Example

Module

Example Tag Names (automatically created by the software)

1

Remote 1794-AENT adapter “FLEX_io_adapter”

FLEX_io_adapter:I
FLEX_io_adapter:I.SlotStatusBits
FLEX_io_adapter:I.Data
FLEX_io_adapter:O
FLEX_io_adapter:O.Data

2

Remote 1794-IA16
“input_module” in slot 0

FLEX_io_adapter:0:C
FLEX_io_adapter:0:C.Config
FLEX_io_adapter:0:C.DelayTime_0
FLEX_io_adapter:0:C.DelayTime_1
FLEX_io_adapter:0:C.DelayTime_2
FLEX_io_adapter:0:C.DelayTime_3
FLEX_io_adapter:0:C.DelayTime_4
FLEX_io_adapter:0:C.DelayTime_5
FLEX_io_adapter:0:I

Rack-optimized connection

3

Remote 1794-OB16
“output_module” in slot 1
Rack-optimized connection

4

Remote 1794-IF2XOF2I
“combo_analog” in slot 2
Direct connection

FLEX_io_adapter:1:C
FLEX_io_adapter:1:C.SSData
FLEX_io_adapter:1:O
FLEX_io_adapter:1:O.Data
FLEX_io_adapter:2:C
FLEX_io_adapter:2:C.InputFIlter
FLEX_io_adapter:2:C.InputConfiguration
FLEX_io_adapter:2:C.OutputConfiguration
FLEX_io_adapter:2:C.RTSInterval
FLEX_io_adapter:2:C.SSCh0OuputData
FLEX_io_adapter:2:C.SSCH1OutputData
FLEX_io_adapter:2:I

If you use rack optimization for an I/O module, it creates tags as aliases for the
tags of the adapter. This logic displays the tag of the device as an alias for the tag
of the adapter. In this example, the tag name of the adapter is in angle brackets.
Tag Name of the I/O Device

Tag Name of the Adapter

Conveyor:2:I.0


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Chapter 4

Control I/O

Notes:

54

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Chapter

5

Interlocking and Data Transfer
between Controllers

This chapter describes how to share data by interlocking controllers
(producing and consuming tags) and transferring messages between controllers
via an EtherNet/IP network.
Topic

Page

Set Up the Hardware

56

Tag Guidelines for Produced or Consumed Data

57

Connections for Produced and Consumed Tags

57

Produce a Tag

59

Consume Data Produced by Another Controller

61

Guidelines for Message (MSG) Instructions

66

Connections for Messages

67

Enter Message Logic

68

Configure a MSG Instruction

71

Communicate with PLC-5 or SLC Controllers

75

Table 9 - Communication Methods
If you want to

And the Data

Then

Page

Interlock operations

Resides on Logix5000™ controllers

Produce and consume a tag

57

Transfer data

Needs regular delivery at an
interval that you specify

Produce and consume a tag

57

Is sent when a specific condition
occurs in your application

Execute a message (MSG)
instruction

66

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Chapter 5

Interlocking and Data Transfer between Controllers

Set Up the Hardware

In this example, the controller in the local chassis produces a tag that the
Logix5000 controller in the remote chassis consumes. The local controller can
also send a MSG instruction to the remote controller.
Figure 6 - Sharing Data and Transferring Messages

Local Chassis with Logix5000
Controller and EtherNet/IP
Communication Module

Data

Remote Chassis with Logix5000
Controller and EtherNet/IP
Communication Module

EtherNet/IP Switch

Workstation

You must complete these tasks before Logix5000 controllers can share tags
over an EtherNet/IP network:
• Set the IP addresses and other network parameters for each EtherNet/IP
communication module.
• Connect all wiring and cabling.
• Configure a communication driver (such as AB-ETHIP-1) for the
programming workstation.

IMPORTANT

56

If you are not using the remote Ethernet communication module to
control I/O modules, set the communication format of these
modules to none.
• 1756-ENBT
• 1756-EN2F
• 1756-EN2T
• 1756-EN2TP
• 1756-EN2TPXT
• 1756-EN2TR
• 1756-EN2TXT
• 1756-EN3TR
• 1756-EN2TSC
• 1756-EN2TRXT

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Interlocking and Data Transfer between Controllers

Tag Guidelines for Produced
or Consumed Data

Chapter 5

To organize tags for produced or consumed data (shared data), follow the
guidelines in Table 10.
Table 10 - Guidelines for the Organization of Tags
Guideline

Details

Create the tags at the
controller scope.

You can share only controller-scoped tags.

Use one of these data types:
• DINT
• REAL
• Array of DINTs or REALs
• User-defined

• To share other data types, create a user-defined data type that contains
the required data.
• Use the same data type for the produced tag and corresponding consumed
tag or tags.

Limit the size of the tag
to ≤ 500 bytes.

If you transfer more than 500 bytes, create logic to transfer the data in
packets.
A size of < 125 DINT words keeps total bytes within 500. This limit helps
reduce the total number of packets for transactions.
If you are producing several tags for the same controller:
• Group the data into one or more user-defined data types. This method
uses fewer connections than does producing each tag separately.
• Group the data according to similar update intervals. To conserve network
bandwidth, use a greater RPI for less critical data.
For example, you could create one tag for data that is critical and another tag
for data that is not as critical.

Combine data that goes to the
same controller.

Terminology
A Logix5000 controller can produce (broadcast) and consume (receive)
system-shared tags.
Table 11 - Tag Definitions
Term

Definition

Produced tag

A tag that a controller makes available for use by other controllers. Multiple
controllers can simultaneously consume (receive) the data. A produced tag
sends its data to one or more consumed tags (consumers) without using logic.
The produced tag sends its data at the RPI of the consuming tag.

Consumed tag

A tag that receives the data of a produced tag. The data type of the consumed
tag must match the data type (including any array dimensions) of the produced
tag. The RPI of the consumed tag determines the period at which the data
updates.

To share produced or consumed tags, two controllers must be attached to the
same EtherNet/IP subnet. Two controllers cannot bridge produced or
consumed tags over two subnets.

Connections for Produced
and Consumed Tags

Logix controllers can produce (broadcast) and consume (receive) systemshared tags that are sent and received via the EtherNet/IP communication
module. Produced and consumed tags each require connections.

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Table 12 - Required Connections for Produced and Consumed Tags
Tag Type

Required Connections

Produced

The local controller (producing) must have one connection for the produced tag
and the first consumer and one more connection for each additional consumer
(heartbeat). The produced tag requires two connections.
As you increase the number of controllers that can consume a produced tag, you
also reduce the number of connections the controller has available for other
operations. Example operations include communication and I/O.

Consumed

Each consumed tag requires one connection for the controller that is consuming
the tag.
IMPORTANT: When you configure a consumed tag, you must add a remote
module to the programming software project for the producing controller to
configure the consuming controller. The default Comm Format when adding a
remote module to the project is Rack Optimized.
Change the Comm Format to None when adding the remote communication
module.

All EtherNet/IP communication modules support as many as 32 produced
multicast connections. Each tag that passes through an EtherNet/IP
communication module uses one connection. Due to this feature, the number
of available connections limits the total number of tags that can be produced or
consumed. If the communication module uses all of its connections for I/O
and other communication modules, no connections remain for produced and
consumed tags.
IMPORTANT

Depending on whether it is producing or consuming a tag, a Logix5000
controller uses its connections differently.

Table 13 - Number Connections for Produced and Consumed Tags
Type of Tag

Device

Number of Connections Used

Produced tag

Logix5000 controller

Number_of_consumers + 1

EtherNet/IP communication
module

1

Logix5000 controller
EtherNet/IP communication
module

1

Consumed tag

This graphic shows a Logix5000 controller producing one tag for consumption
by another Logix5000 controller. In this example, the producing controller
uses two connections and every other Logix module/controller uses only one
connection.

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Figure 7 - Logix5000 Controller in Local Chassis Producing a Single Tag for a Logix5000
Controller in a Remote Chassis
Local Controller (producer controller)- 1768 CompactLogix™ controller
Connections Used = 2 (1 + Number of consumers)

Remote Controller (consumer controller) - ControlLogix controller
Connections Used = 1

EtherNet/IP

Logix5575

ControlNet

EtherNet/IP

10/100 BASE T

RUN FORCE SD

OK

LNK1 LNK2 OK

10/100 BASE T

LNK1 LNK2 OK

REM PR
OG
RUN

Local Communication Module 1768-ENBT
Connections Used = 1

1

2

1

2

Remote Communication Module
- 1756-EN2T
Connections Used = 1

At its limits, a Logix5000 controller that produced 125 tags, each with only 1
consumer, the controller would use all of its available 250 connections. In this
example, the Ethernet modules that are used to communicate the tags would
use only 125 connections. An example of the different.
For more information on how to use connections over an EtherNet/IP
network, see Ethernet Design Considerations Reference Manual, publication
ENET-RM002.

Produce a Tag

To produce a tag, configure the produced tag in the programming software
project for the local (producer) controller. You do not have to configure the
consumer controllers in the I/O Configuration folder of the producer
controller.

Configure the Produced Tag
To configure the produced tag, follow these steps.
1. In the Controller Organizer if the producer, right-click the Controller
Tags folder and choose Edit Tags.

The Controller Tags dialog box appears.

You can produce only controller-scoped tags.
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2. In the Controller Tags window, right-click the tag that you want to
produce and choose Edit Tag Properties.

The Tag Properties dialog box appears.

3. From the Type pull-down menu, choose Produced.
4. Click Connection.
The Produced Tag Connection dialog box appears.

5. In the Max Consumers field, type the maximum number of controllers
that consume (receive) the tag.
6. Click OK.

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To consume a produced tag, specify both the producer controller and the
produced tag in the programming software project for the remote (consumer)
Logix5000 controller.

Consume Data Produced by
Another Controller

Add the Producer Controller to the I/O Configuration of the
Consumer
Add the producer controller to the I/O Configuration folder of the remote
controller. In the folder, organize the controllers and communication modules
into a hierarchy of tree/branch and parent/child.
Figure 8 - Logix5000 Controller in Local Chassis Consuming a Single Tag for a Logix5000
Controller in a Remote Chassis
Local Controller (consumer controller) - ControlLogix controller
Connections Used = 1

EtherNet/IP

Logix5575

ControlNet

EtherNet/IP

10/100 BASE T

RUN FORCE SD

OK

LNK1 LNK2 OK

Remote Controller (producer controller)- 1768 CompactLogix™ controller
Connections Used = 2 (1 + Number of consumers)

10/100 BASE T

LNK1 LNK2 OK

REM PR
OG
RUN

Local Communication Module 1756-EN2T
Connections Used = 1

1

2

1

Remote Communication
Module - 1768-ENBT
Connections Used = 1

2

To add a producer controller to the I/O of the consumer controller, follow
these steps.
1. Add the local communication module for the consumer controller.
2. Add the remote communication module for the producer controller.
3. Add the producer controller.
This graphic shows the I/O configuration for the consumer controller after the
modules are added.

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To add a producer controller to the I/O Configuration folder, follow these
steps.
1. In the Controller Organizer, right-click the remote backplane and
choose New Module.

The Select Module Type dialog box appears.
2. Click the By Category tab and choose your producer controller.

3. Click OK.
Depending on the controller type, the Select Major Revision dialog box
can appear. If the dialog box appears, choose the major revision of the
module and click OK.

The New Module dialog box appears.

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4. Configure your new module.
• In the Name field, type the name of your module.
• In the Slot field, type the chassis slot number.
• From the Electronic Keying pull-down menu, choose the keying level
that fits your application.

5. Click OK.
IMPORTANT

The number and type of configuration parameters on the New
Module dialog box varies according to the controller type.

Create the Consumed Tag
To create the consumed tag, follow these steps.
1. In the programming software of the project of the consumer controller,
right-click the Controller Tags folder and choose Edit Tags.

The Controllers Tag dialog box appears.

Only controller-scoped tags can consume data.

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2. In the Controller Tags window, right-click the tag that consumes the
data and choose Edit Tag Properties.

The Tag Properties dialog box appears.
3. From the Type pull-down menu, choose Consumed.
4. In the Data Type field, type a data type that matches the type assigned to
the produced tag.
5. Click Connection.

The Consumed Tag Connection dialog box appears.
6. From the Producer pull-down menu, choose the controller that
produces the data.

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7. In the Remote Data field, type the tag name or instance number of the
produced data.
8. In the RPI field, type the requested packet interval (RPI) for the
connection.

Only set the RPI to the rate the application requires.
IMPORTANT

The RPI determines the number of packets per second that the
module produces on a connection. Each module can only produce
a limited number of packets per second. If you exceed this limit, it
prevents the module from opening more connections.

For information on RPI and how it affects the actual packet interval
(API), see the Ethernet Design Considerations Reference Manual,
publication ENET-RM002.
9. Click OK.

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Guidelines for Message (MSG)
Instructions

Follow these guidelines.
Table 14 - MSG Instruction Guidelines
Guideline

Description

For each MSG instruction, create a
control tag.

Each MSG instruction requires its own control tag:
• Data type = MESSAGE
• Scope = controller
• The tag cannot be part of an array or a user-defined data type.

Keep the source and destination
data at the controller scope.

A MSG instruction can only access tags that are in the Controller Tags folder.

If your MSG is to a module that uses
16-bit integers, use a buffer of INTs
in the MSG and DINTs throughout
the project.

If your message is to a module that uses 16-bit integers, such as a PLC-5® or
SLC™ 500 controller, and it transfers integers (not REALs), use a buffer of INTs
in the message and DINTs throughout the project.

Cache the connected MSGs that
execute most frequently.

This process increases the efficiency of your project because Logix5000
controllers execute more efficiently and use less memory when working with
32-bit integers (DINTs).
Cache the connection for those MSG instructions that execute most
frequently, up to the maximum number permissible for your controller
revision.
This process optimizes execution time because the controller does not have to
open a connection each time the message executes.

If you want to enable more than 16
MSGs at one time, use some type of
management strategy.

If you enable more than 16 MSGs at one time, some MSG instructions can
experience delays when they enter the queue. To make sure that each
message executes, perform one of these tasks:
• Enable each message in sequence.
• Enable the messages in groups.
• Program a message to communicate with multiple modules.
• Program logic to coordinate the execution of messages.

Keep the number of unconnected
and uncached MSGs less than the
number of unconnected buffers.

The controller can have 10...40 unconnected buffers. The default number is
10.
• If all unconnected buffers are in use when an instruction leaves the
message queue, the instruction errors and does not transfer the data.
• You can increase the number of unconnected buffers to a maximum of 40.

For more information on programming MSG instruction, see the Logix5000
Controller General Instructions Reference Manual, publication 1756-RM003.
The individual system user manuals for Logix5000 controllers also provide
MSG examples unique to specific controller platforms.

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Connections for Messages

Chapter 5

Messages transfer data to other modules, such as other controllers or operator
interfaces. Each message uses one connection, regardless of how many modules
are in the message path. To conserve connections, you can configure one
message to read from or write to multiple modules.
These connected messages can leave the connection open (cache) or close the
connection when the message has finished transmitting.
Table 15 - Message Connections
Type of Message

Communication Method Used

Connection Used

CIP data table read or write

CIP

Yes

PLC-2®, PLC-3®, PLC-5®, or SLC™ (all
types)

CIP

No

CIP with Source ID

No

DH+™

Yes

CIP

Your choice(1)

CIP generic
Block transfer read or write

Yes

(1) You can connect CIP generic messages, but for most applications we recommend that you leave CIP generic messages
unconnected.

Cache Message Connections
Use the execution rate of the message to determine whether to cache a
connection or not.
Table 16 - Guidelines for Caching Message Connections
Message Execution

Instruction Configuration

Repeated

Cache the connection.
Important: Caching keeps the connection open and optimizes execution time.
If you open a connection each time the message executes, it increases execution
time.

Infrequent

Do not cache the connection.
Important: Not caching closes the connection upon completion of the
message, which frees up the connection for other uses.

Communicate with the
Socket Object Via a MSG
Instruction

Some EtherNet/IP devices support the use of a CIP Generic MSG instruction
to request socket services. For more information, see EtherNet/IP Socket
Interface Application Technique, ENET-AT002.

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To send or receive data from an EtherNet/IP communication module via a
message, you must program a MSG instruction in the logic of the local
controller. If the target module is configured in the I/O Configuration folder
of the controller, browse to select the module or manually type the message
path in the MSG instruction.

Enter Message Logic

Add the EtherNet/IP Communication Module to the I/O
Configuration of the Local Controller
To use the Browse button to select the target device of a MSG instruction, add
that remote device to the I/O Configuration folder of the local controller.
Within the I/O Configuration folder, organize the local and remote devices
into a hierarchy of tree/branch, parent/child.
Figure 9 - Logix5000 Controller in Local Chassis Sending a Message to a Logix5000 Controller in
a Remote Chassis
Local Controller - ControlLogix Controller

EtherNet/IP

Logix5575

ControlNet

EtherNet/IP

10/100 BASE T

RUN FORCE SD

OK

LNK1 LNK2 OK

Remote Controller - ControlLogix Controller

EtherNet/IP

Logix5575

10/100 BASE T

ControlNet

EtherNet/IP

10/100 BASE T

RUN FORCE SD

LNK1 LNK2 OK

REM PR
OG
RUN

OK

LNK1 LNK2 OK

10/100 BASE T

LNK1 LNK2 OK

REM PR
OG
RUN

Local Communication
Module - 1756-ENBT

Remote Communication
Module - 1756-ENBT
1

2

1

2

1

2

1

2

For a typical local/remote MSG structure, following the steps.
1. Add the local communication module for the local controller.
2. Add the remote communication module for the remote controller.
3. Add the remote controller.
This graphic shows the I/O configuration of the local controller after a local
EtherNet/IP communication module is added.

Select a communication format for a communication module based on the
modules in its remote chassis.

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Table 17 - Module Communication Formats
Conditions

Use This Communication Format

The remote chassis contains only analog modules,
diagnostic digital modules, fused output modules, or
communication modules

None

The remote chassis contains only standard, digital input
and output modules (no diagnostic modules or fused
output modules)

Rack Optimization

You want to receive I/O module and chassis slot
information from a rack-optimized remote chassis owned
by another controller

Listen-Only Rack Optimization

To add a module to the I/O Configuration folder, follow these steps.
1. In the programming software, right-click the level to which you want to
add the new module and choose New Module.

The Select Module Type dialog box appears.
2. Click the By Category tab and choose your EtherNet/IP
communication module.
3. Click OK.

Depending on the EtherNet/IP communication module, the Select
Major Revision dialog box can appear. If the dialog box appears, choose
the major revision of the module and click OK.
The New Module dialog box appears.

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4. Configure your new module.
• In the Name field, type the name of your module.
• In the IP Address field, type the module IP address.
• In the Slot field, type the chassis slot number.
• Click Change to configure these parameters:
– Module Revision
– Electronic Keying
– Communication Format
5. Click OK.

IMPORTANT

The number and type of configuration parameters on the New
Module dialog box varies according to the EtherNet/IP
communication module type.

Enter a Message
To enter a message, follow these steps.
1. Use relay ladder logic to enter a MSG instruction.
2. To configure the MSG instruction, Click
EXAMPLE

...

.

Enter a MSG instruction

If count_send = 1 and count_msg.EN = 0 (MSG instruction is not already enabled), then execute a MSG instruction that sends data to another controller.
count_send

70

count_msg.en
/

MSG
Type - Unconfigured
Message Control

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

count_msg

...

EN
DN
ER

Interlocking and Data Transfer between Controllers

Configure a MSG Instruction

Chapter 5

To configure a MSG instruction, follow these steps.
1. Click

...

in the MSG box.

The Message Configuration dialog box appears.
2. Click the Configuration tab and specify the type of MSG instruction.

Configure a MSG to a Logix5000 Controller
If you want to

For this item

Type or choose

Read (receive) the data

Message Type

CIP Data Table Read

Source Element

First element of the tag that contains data in the other controller

Number of Elements

Number of elements to transfer

Destination Tag

First element of the tag (controller-scoped) in this controller for the data

Message Type

CIP Data Table Write

Source Tag

First element of the tag (controller-scoped) in this controller that contains the data

Number of Elements

Number of elements to transfer

Destination Element

First element of the tag for the data in the other controller

Write (send) the data

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Configure a MSG to an SLC 500 Controller
If the data is

And you want to

For this item

Type or choose

Integer

Read (receive) data

Message Type

SLC Typed Read

Source Element

Data table address in the SLC 500 controller (for example, N7:10)

Number of Elements

Number of integers to transfer

Destination Tag

First element of int_buffer

Message Type

SLC Typed Write

Source Tag

First Element of int_buffer

Number of Elements

Number of integers to transfer

Destination Element

Data table address in the SLC 500 controller (for example, N7:10)

Message Type

SLC Typed Read

Source Element

Data table address in the SLC 500 controller (for example, F8:0)

Number of Elements

Number of values to transfer

Destination Tag

First element of the tag (controller-scoped) in this controller for the data

Message Type

SLC Typed Write

Source Tag

First element of the tag (controller-scoped) in this controller that contains the data

Number of Elements

Number of values to transfer

Destination Element

Data table address in the SLC 500 controller (for example, F8:0)

Write (send) data

Floating point (REAL)

Read (receive) data

Write (send) data

Configure a MSG to a PLC-5 Controller
If the data is

And you want to

For this item

Type or choose

Integer

Read (receive) data

Message Type

PLC5 Typed Read

Source Element

Data table address in the PLC-5 controller (for example, N7:10)

Number of Elements

Number of integers to transfer

Destination Tag

First element of int_buffer

Write (send) data

Floating point (REAL)

Read (receive) data

Write (send) data

Message Type

PLC5 Typed Write

Source Tag

First element of int_buffer

Number of Elements

Number of integers to transfer

Destination Element

Data Table address in the PLC-5 controller (for example, N7:10)

Message Type

PLC5 Typed Read

Source Element

Data table address in the PLC-5 controller (for example, F8:0)

Number of Elements

Number of values to transfer

Destination Tag

First element of the tag (controller-scoped) in this controller for the data

Message Type

PLC5 Typed Write

Source Tag

First element of the tag (controller-scoped) in this controller that contains the
data

Number of Elements

Number of values to transfer

Destination Element

Data table address in the PLC-5 controller (for example, F8:0)

3. Click the Communication tab.

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4. In the Path field, type the communication path.
For a message to a ControlLogix® controller, this Message Configuration
dialog box appears.

Select the Large Connection checkbox to use a large 4000 byte
connection size, or clear the checkbox to use a standard 500 byte
connection size.
A large connection is only available with connected MSG instructions.
For information about how to use the Connected or Cache
Connections options, refer to the Logix5000 Controllers Messages
Programming Manual, publication 1756-PM012.
For a message to a SLC 500 or PLC-5 processor, this RSLogix™ Message
Configuration dialog box appears.

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5. If the target module is configured in the I/O Configuration folder of the
originating controller, click Browse to select the module or manually
type the path to the target module.
A manually typed path includes the following:
• Name of the local EtherNet/IP communication module
• The port the message exits (2 for EtherNet/IP)
• The IP address of the next module in the path, which could be the
target module
EXAMPLE

Communication path from a Logix5000 controller to a Logix5000 controller
over an EtherNet/IP network
Ethernet Network

55 E
75 N
2T

Message

IP Address
168.127.127.12
55 E
75 N
2T

washer, 2, 168.127.127.12, 1, 0

74

Where

Indicates

Washer

Name of the 1756-ENBT, 1756-EN2F, 1756-EN2T, 1756-EN2TR,
1756-EN2TXT, or 1756-EN3TR module

2

Ethernet port of the 1756-ENBT, 1756-EN2F, 1756-EN2T, 1756EN2TR, 1756-EN2TXT, or 1756-EN3TR module

168.127.127.12

IP address of the 1756-ENBT, 1756-EN2F, 1756-EN2T, 1756-EN2TR,
1756-EN2TXT, or 1756-EN3TR Module in the destination chassis

1

Backplane port of the 1756-ENBT, 1756-EN2F, 1756-EN2T, 1756EN2TR, 1756-EN2TXT, or 1756-EN3TR Module in the destination
chassis

0

Slot number of the destination controller

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Communicate with PLC-5 or
SLC Controllers

Chapter 5

If the message is to a PLC-5 or SLC 500 processor and it reads or writes
integers (not REALs), use a buffer of INTs in the message. Remember these
considerations:
• Logix5000 controllers execute more efficiently and use less memory
when working with 32-bit integers (DINTs).
• PLC-5 and SLC 500 processors require 16-bit integers.
• Messages require an INT buffer.
• Data can be moved into or out of the buffer as needed.

Converting between INTs and DINTs
If the message is to a device that uses 16-bit integers, such as a PLC-5 or SLC
500 controller, and it transfers integers (not REALs), use a buffer of INTs in
the message and DINTs throughout the project. This configuration increases
the efficiency of your project.
1
Read 16-Bit Integers

2

Data From
the Device

Buffer of INTs

DINTs For Use In
the Project

Word 1

INT_Buffer[0]

DINT_Array[0]

Word 2

INT_Buffer[1]

DINT_Array[1]

Word 3

INT_Buffer[2]

DINT_Array[2]

1. The Message (MSG) instruction reads 16-bit integers (INTs) from the
device and stores them in a temporary array of INTs.
2. A File Arith/Logical (FAL) instruction converts the INTs to DINTs for
use by other instructions in your project.
1
Write 16-Bit
Integers

2

DINTs From the
Project

Buffer of INTs

Data For the
Device

DINT_Array[0]

INT_Buffer[0]

Word 1

DINT_Array[1]

INT_Buffer[1]

Word 2

DINT_Array[2]

INT_Buffer[2]

Word 3

1. An FAL instruction converts the DINTs from the Logix5000 controller
to INTs.
2. The MSG instruction writes the INTs from the temporary array to the
device.

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Mapping Tags
A Logix5000 controller stores tag names on the controller so that other devices
can read or write data without having to know physical memory locations.
Many products only understand PLC/SLC data tables, so the Logix5000
controller offers a PLC/SLC mapping function that enables you to map Logix
tag names to memory locations.
• You have to map only the file numbers that are used in messages; the
other file numbers do not need to be mapped.
• The mapping table is loaded into the controller and is used whenever a
logical address accesses data.
• You can access only controller-scoped tags (global data).

• For each file that is referenced in a PLC-5 or SLC command, make a
map entry with one of these methods:
– Type the PLC/SLC file number of the logical address
– Type or select the Logix5000 controller-scoped (global) tag that
supplies or receives data for the file number (You can map multiple
files to the same tag.)
• For PLC-2 commands, specify the tag that supplies or receives the data.
When you map tags, remember these guidelines:
• Do not use file numbers 0, 1, and 2. These files are reserved for Output,
Input, and Status files in a PLC-5 processor.
• Use PLC-5 mapping only for tag arrays of data type INT, DINT, or
REAL. If you attempt to map elements of system structures, it can
produce undesirable effects.
• Use the PLC file identifier of N or B when you access elements in an
INT tag array.
This example shows how to use a buffer of INTs.

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EXAMPLE

Read integers from a PLC-5 controller.
ATTENTION: When condition turns on, reads 16-bit integer values (INTs) and stores them in int_buffer. Then the FAL
instruction moves the values to dint_array. This process converts the values to 32-bit integers (DINTs), for use by other
instructions in the ControlLogix controller.

EXAMPLE

Write integers to a PLC-5 controller.
ATTENTION: When condition turns on, it moves the values in dint_array to int_buffer. This process converts the values
to 16-bit integers (INTs). Then the message instruction sends int_buffer to the other controller.

42424

Where

Is an

dint_array

Array of DINTs that are used in the ControlLogix controller

int_buffer

Array of INTs with the same number of elements as dint_array

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Receive MSGs from PLC-5 or SLC 500 Controllers
To receive MSGs from PLC-5 or SLC 500 processors, follow these steps.
1. If the originating controller is a PLC-5 or SLC 500 processor, in the
MSG instruction, select PLC5.

If the controller is a

For this section

And this item

Specify

PLC-5

This PLC-5

Communication Command

PLC-5 Typed Read or PLC-5 Typed Write

Data Table Address

Starting address of the data in the PLC-5 controller

Size in Elements

Number of elements to read or write

Port Number

2

Data Table Address

Type, in quotation marks [“ “], the name of the tag in the ControlLogix
controller (for example, “count”).

MultiHop

Select Yes.

Communication Command

PLC5 Read or PLC5 Write

Data Table Address

Starting address of the data in the SLC 500 controller

Size in Elements

Number of elements to read or write

Channel

1

Data Table Address

Type, in quotation marks [“ “], the name of the tag in the ControlLogix
controller (for example, “count”).

MultiHop

Select Yes

Target Device

SLC 500

This Controller

Target Device

2. On the MultiHop tab, specify the following:
• IP address of the EtherNet/IP communication module that is local to
the Logix5000 controller
• Slot number of the Logix5000 controller

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Chapter

6

Send Email

This chapter describes how to send an email through an EtherNet/IP
communication module.
IMPORTANT

The 1756-EN2TSC module does not support this capability.

Topic

Page

EtherNet/IP Communication Module as an Email Client

79

Send Email Via a Controller-initiated Message Instruction

81

Enter Email Text

94

Possible Email Status Codes

94

For email, the EtherNet/IP communication module can be remote or local to
the controller.

EtherNet/IP Communication
Module as an Email Client

The EtherNet/IP communication module is an email client that uses a mail
relay server to send email.
IMPORTANT

The EtherNet/IP communication module can send an email to only one
recipient at a time. The module cannot mail to a distribution list.

Table 18 - Ethernet Email
Desired Action

Required Tasks

Send an email to specific personnel when a controller
application generates an alarm or reaches a certain
condition

Program the controller to send a MSG instruction to the
EtherNet/IP communication module
The MSG instruction then instructs the
EtherNet/IP communication module to send the email
text (contained within the MSG instruction) to the mail
relay server.
Multiple controllers can use the same EtherNet/IP
communication module to initiate email.

Send controller or application status information
regularly to a project manager

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Chapter 6

Send Email

The EtherNet/IP communication module sends only the content of a MSG
instruction as an email to a mail relay server. Delivery of the email depends on
the mail relay server. The EtherNet/IP communication module does not
receive email.
Figure 10 - Sample System
ControlLogix® Controller With 1756-ENBT, 1756-EN2F, 1756-EN2T, 1756EN2TR, 1756-EN2TXT, or 1756-EN3TR Module
Firewall/Router

Redundancy Module

Logix5575

EtherNet/IP

EtherNet/IP

ControlNet

EtherNet/IP

ControlNet

10/100 BASE T

RUN FORCE SD

RUN

OK

PRI COM OK

LNK NET OK

LNK1 LNK2 OK

LNK NET OK

REM PR
OG

1

2

Mail Relay
Server

Ethernet Switch

Ethernet Switch

1769-L35E CompactLogix™ Controller

Table 19 - Sample System Capabilities

80

Device

Capability

ControlLogix controller
CompactLogix controller

Send a MSG instruction to the 1756-ENBT module to initiate sending an email
to the mail relay server.
Use the path of the MSG instruction to identify the 1756-ENBT module as the
target of the MSG instruction.

1756-ENBT, 1756-EN2F, 1756EN2T, 1756-EN2TR, 1756-EN2TXT,
EN2TRXT, or 1756-EN3TR module

Send an email to the mail relay server from the email interface on the Send an
Email link.
This interface requires that you enter all email information.

Mail relay server

Send email to specified recipients.
The mail relay server determines the delivery of any email sent through an
EtherNet/IP communication module, whether via a MSG instruction or from
its built-in interface.

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Send Email Via a Controllerinitiated Message
Instruction

Chapter 6

A Logix controller can send a generic CIP message instruction to the
EtherNet/IP communication module that instructs the module to send an
email message to a SMTP mail relay server that uses the standard SMTP
protocol. This process automatically communicates controller data and
application conditions to appropriate personnel.
IMPORTANT

Be careful to write the ladder logic to be sure the MSG instructions are
not continuously triggered to send email messages.

Some mail relay servers require a domain name be provided during the initial
handshake of the SMTP session. For these mail relay servers, specify a domain
name when configuring the network settings of the EtherNet/IP
communication module.
For additional information, see Configure an EtherNet/IP Communication
Module to Operate on the Network on page 17.

Create String Tags
You need three controller-scoped string tags. Each tag performs one of
these functions:
• Identifies the mail server
• Contains the email text
• Contains the status of the email transmission
The default STRING data type supports up to 82 characters. In most cases,
this limit is sufficient to contain the address of the mail server. For example, to
create tag EmailConfigstring of type STRING, follow these steps.
1. Click

...

in the Value column of the Controller Tags dialog box.

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The String Browser dialog box appears.

2. Type the IP address or host name of the mail server.
3. Click OK.
The tags for the email text and transmission status can contain up to 474
characters. For these tags, you must create a user-defined STRING data type.
The default STRING data type in the programming software is not large
enough for most email text.
To create a user-defined STRING data type, follow these steps.
1. In the Data Types folder in the programming software, navigate to and
right-click the Strings folder, and choose New String Type.

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2. Create the EmailString data type.

3. Create one controller-scoped tag, such as EWEB_EMAIL, of this new
data type to contain the email text.
4. Create a second controller-scoped tag, such as EmailDstStr, of this new
data type to contain the transmission status.
Both of these tags are of type EmailString.
5. Click

...

in the Value column of the Controller Tags dialog box.

Tag for Status
Tag for Email Text

The String Browser dialog box appears.
6. Type your email.
The text of the email does not have to be static. You can program a
controller project to collect specific data to be sent in an email.
7. Click OK.

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For more information on how to use ladder logic to manipulate string data, see
the Logix5000™ Controllers Common Procedures Programming Manual,
publication 1756-PM001.

Enter the Ladder Logic
Ladder logic requires two MSG instructions. One MSG instruction configures
the mail server and must be executed only once. The second MSG instruction
triggers the email. Execute this email MSG instruction as often as needed.
SetServer

The first rung configures the mail server. The second rung sends the email text.

Configure the MSG Instruction that Identifies the Mail Relay Server
To configure the MSG instruction that identifies the mail relay server, follow
these steps.
1. In the MSG instruction, click the Communication tab.

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2. In the Path field, type the path for the MSG instruction. The path starts
with the controller initiating the MSG instruction.
Type the number of the port from which the message exits and the
address of the next module in the path.
For example, if the EtherNet/IP communication module is in the same
chassis as the controller and is in slot 2, the path is: 1, 2.
For more information on how to configure the path of a MSG
instruction, see the Logix5000 Controllers General Instructions
Reference Manual, publication 1756-RM003.
3. Click the Configuration tab.
4. Configure the MSG parameters for sending an email.
• From the Service Type pull-down menu, choose Attribute Single
• In the Instance field, type 1.
• In the Class field, type 32f.
• In the Attribute field, type 5.
• From the Source Element pull-down menu, choose the tag that
contains your email text.
• In the Source Length field, type the number of characters in the email
plus four.
In this example, you would enter 13 for the number of characters plus
4 for a total of 17.

The Source Length is the number of characters in the STRING tag
that identifies the mail relay server plus 4 characters.
In this example, the tag contains 13 characters.

After the MSG instruction that configures the mail relay server executes
successfully, the controller stores the mail relay server information in
nonvolatile memory. The controller retains this information, even
through power cycles, until another MSG instruction changes the
information.

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Configure the MSG Instruction that Contains the Email Text
To configure the MSG instruction that contains the email text, perform this
procedure.
1. Click the Configuration tab.
The Source Length is the number of characters in the email tag plus 4
characters.
In this example, the email text contains 65 characters.
2. Configure the MSG parameters for sending an email.
• From the Service Type pull-down menu, choose Custom.
• In the Service Code field, type 4b.
• In the Instance field, type 1.
• In the Class field, type 32f.
• In the Attribute field, type 0.
• From the Source Element pull-down menu, choose the tag that
contains your email text.
• In the Source Length field, type the number of characters in the email
plus four.
In this example, you would enter 65 for the number of characters plus
4 for a total of 69.
• From the Destination pull-down menu, choose a tag to contain the
status of your email transmission.

The Source Length is the number of characters in the STRING tag
that identifies the mail relay server plus 4 characters.
In this example, the tag contains 65 characters.

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3. Click the Communication tab.

4. In the Path field, type the path from the controller to the EtherNet/IP
communication module.
The path starts with the controller initiating the MSG instruction. The
second number in the path represents the port from which the message
exits and the address of the next module in the path.
For example, if the EtherNet/IP communication module is in the same
chassis as the controller and is in slot 2, the path is: 1, 2.
5. If all devices in the path are configured in the I/O Configuration tree of
the initiating controller, click Browse to select the target module.
The software automatically completes the path.
6. Click OK.
For more information on how to configure the path of an MSG instruction, see
the Logix5000 Controllers General Instructions Reference Manual,
publication 1756-RM003.
7. Configure the MSG parameters for disabling the Email Object.
• From the Service Type pull-down menu, choose Set Attribute Single
• In the Instance field, type 0.
• In the Class field, type 32f.
• In the Attribute field, type 8.
• From the Source Element pull-down menu, choose the tag that
contains your email text.
• This example uses DisableEmailObject.
• In the Source Length field, type 1.

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Configure the Email Object
Ladder logic requires two MSG instructions. One MSG instruction disables
the mail server and must be executed only once. The second MSG instruction
enables the email. Execute this email MSG instruction as often as needed.

Disable the Email Object
IMPORTANT

If you disable the Email Object, it is permanently disabled and a factory reset
is required to enable it again.

You can disable the Email Object by setting the class attribute 0x08 to 0. After
that operation, all object-specific services and all instance attributes are
unavailable for writing and reading. Furthermore, the Object Enable attribute
is read only. The Email Object is permanently disabled and a factory reset is
required to enable it again. By default, the Email Object is enabled. Table 20
lists the MSG block parameters to disable an Email Object.
Table 20 - Email Object Parameters

88

Service

0x10

Class

0x32F

Instance

0x00

Attribute

0x08

Data

0x00

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To disable the Email Object, perform this procedure.
1. Create a tag, DisableEmailObject.
2. Select SINT for the data type.

3. Create a message object.
This example names the message object MSG_Disable.
4. In the Data Type category of the Edit Tags window, change the data type
to MESSAGE.
5. In the MSG_Disable tag, click the Communication tab.

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6. In the Path field, type the path for the MSG instruction. The path starts
with the controller initiating the MSG instruction.
Type the number of the port from which the message exits and the
address of the next module in the path.
IMPORTANT

Currently, the only module that supports this application is the 1756-EN2T
series D module with firmware revision 10.010.

For example, if the EtherNet/IP communication module is in the same
chassis as the controller and is in slot 2, the path is: 1, 2. The path in this
example is 1, 1. For this use case, the path is always 1, <1756-EN2T
module slot number>.
For more information on how to configure the path of a MSG
instruction, see the Logix5000 Controllers General Instructions
Reference Manual, publication 1756-RM003.
7. Click the Configuration tab.

8. Configure the MSG parameters for sending an email.
• From the Service Type pull-down menu, choose Set Attribute Single
• In the Instance field, type 0.
• In the Class field, type 32f.
• In the Attribute field, type 8.
• Create a tag that is type SINT and set the tag value to 0. This example
uses DisableEmailObject.
• In the Source Length field, type 1.
9. Click Apply.
10. In the ladder logic, toggle message to execute.

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The value is returned in the second message. Since there is no
destination element, you do not get a response. However, you receive the
DN bit set.

Get Email Object Status
To determine if the email object is disabled, perform this procedure.
1. Create a tag, EmailObjectStatus.
2. Select SINT for the data type.

3. Create a message object.
This example names the message object MSG_EmailObjectStatus.
4. In the Data Type category of the Edit Tags window, change the data type
to MESSAGE.

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5. In the MSG_EmailObjectStatus instruction, click the Communication
tab.

6. In the Path field, type the path for the MSG instruction. The path starts
with the controller initiating the MSG instruction.
Type the number of the port from which the message exits and the
address of the next module in the path.
For example, if the EtherNet/IP communication module is in the same
chassis as the controller and is in slot 2, the path is: 1, 2. The path in this
example is 1, 1.
For more information on how to configure the path of a MSG
instruction, see the Logix5000 Controllers General Instructions
Reference Manual, publication 1756-RM003.

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7. Click the Configuration tab.

8. Configure the MSG parameters for sending an email.
• From the Service Type pull-down menu, choose Get Attribute Single.
• In the Instance field, type 0.
• In the Class field, type 32f.
• In the Attribute field, type 8.
• From the Destination Element pull-down menu, choose the tag that
contains your email text. This example uses EmailObjectStatus.
9. Click Apply.
10. In the ladder logic, toggle message to execute.
If the MSG_EmailObjectStatus.DN bit is set and the value of the
EnableObjectStatus is 0, then the Email Object is disabled. If the value
of the EnableObjectStatus is 1, then the Email Object is enabled.

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Enter Email Text

Use the string browser to type the text of the email. To include To:, From:, and
Subject: fields in the email, use  symbols to separate each of these
fields. The To: and From fields are required; the Subject: field is optional. For
example:
To: email address of recipient 
From: email address of sender 
Subject: subject of message 
body of email message
An email message must not exceed 474 characters in length. An additional
4-byte string-length value is added to the tag. As a result, the maximum source
length is 478 characters.

Possible Email Status Codes

Examine the destination element of the email MSG to see whether the email
was successfully delivered to the mail relay server. A successful delivery
indicates that the mail relay server placed the email message in a queue for
delivery. This notification does not mean that the intended recipient received
the email message. Table 21 lists the possible codes that a destination element
could contain.
Table 21 - Email Status Code Descriptions

94

Error
Code
(Hex)

Extendederror Code
(Hex)

Description

0x00

None

Delivery successful to the mail relay server.

0x02

None

Resource unavailable. The email object was unable to obtain memory
resources to initiate the SMTP session.

0x08

None

Unsupported Service Request. Make sure that the service code is 0x4B and the
Class is 0x32F.

0x11

None

Reply data too large. The Destination string must reserve space for the SMTP
server reply message. The maximum reply can be 470 bytes.

0x13

None

Configuration data size too short. The Source Length is less than the Source
Element string size plus the 4-byte length. The Source Length must equal the
Source Element string size + 4.

0x15

None

Configuration data size too large. The Source Length is greater than the Source
Element string size plus the 4-byte length. The Source Length must equal the
Source Element string size + 4.

0x19

None

Data write failure. An error has occurred when attempting to write the SMTP
server address (attribute 4) to nonvolatile memory.

0xFF

0x0100

Error that an email server returns; check the Destination string for reason. The
email message was not queued for delivery.

0x0101

SMTP mail server not configured. Attribute 5 was not set with a SMTP server
address.

0x0102

‘To:’ address not specified. Attribute 1 was not set with a ‘To:’ address AND
there is not a ‘To:’ field header in the email body.

0x0103

‘From:’ address not specified. Attribute 2 was not set with a ‘From:’ address
AND there is not a ‘From:’ field header in the email body.

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Chapter 6

Table 21 - Email Status Code Descriptions
Error
Code
(Hex)

Extendederror Code
(Hex)

Description

0xFF

0x0104

Unable to connect to SMTP mail server set in Attribute 5. If the mail server
address is a host name, make sure that the device supports DNS, and that a
Name Server is configured. If the host name is not fully qualified, for example,
‘mailhost’ and not ‘mailhost.xx.yy.com’ then the domain must be configured
as ‘xx.yy.com’. Try ‘ping ’ to make sure that the mail
server is reachable from your network. Also try ‘telnet 
25’, which attempts to initiate a SMTP session with the mail server via telnet
over port 25. (If you connect then type ‘QUIT’).

0x0105

Communication error with SMTP mail server. An error occurred after the initial
connection with the SMTP mail server.
See the ASCII text following the error code for more details as to the type of
error.

0x0106

SMTP mail server host name DNS query did not complete. A previous send
service request with a host name as the SMTP mail server address did not yet
complete. A timeout for a DNS lookup with an invalid host name can take up to
3 minutes. Long timeouts can also occur if a domain name or name server is
not configured correctly.

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7

Communicate with PanelView Terminals

This chapter describes how a controller uses an EtherNet/IP communication
module to communicate with PanelView™ and PanelView Plus terminals over
an EtherNet/IP network.
Topic

Page

Set Up the Hardware

97

Connections to PanelView Terminals

98

Add a PanelView Terminal

99

Organize Controller Data for a PanelView Terminal

103

Connections to FactoryTalk View Applications

103

In this example, the controller in the local chassis shares data with an HMI
application on the EtherNet/IP network. This application could be running
these components:

Set Up the Hardware

• PanelView terminal
• PanelView Plus terminal
• Workstation running Factory Talk View software
• Workstation running a FactoryTalk® Enterprise application, such as
FactoryTalk View Machine Edition or FactoryTalk View Supervisory
Edition
Figure 11 - Ethernet Communication with PanelView Terminal
Local Chassis Containing a
Logix5000™ Controller with
an EtherNet/IP Connection

Redundancy Module

Logix5575

EtherNet/IP

EtherNet/IP

ControlNet

EtherNet/IP

ControlNet

10/100 BASE T

RUN FORCE SD

RUN

OK

PRI COM OK

LNK NET OK

LNK1 LNK2 OK

LNK NET OK

REM PR
OG

Data
1

HMI with EtherNet/IP
Connectivity

2

EtherNet/IP Switch

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Logix5000 Controller Combinations
Your controller type determines which communication module to use.
Table 22 - Choosing a Communication Module
Controllers

Communication Modules

ControlLogix

1756-ENBT, 1756-EN2F, 1756-EN2T, 1756-EN2TR, 1756-EN2TXT,
1756-EN3TR, 1756-EWEB, or 1756-EN2TSC communication modules

1769 CompactLogix™

A built-in EtherNet/IP port on the controller.

1768 CompactLogix

1768-ENBT, 1768-EWEB EtherNet/IP communication modules

PowerFlex® 700S with DriveLogix™

1788-ENBT EtherNet/IP communication module.

You must complete these tasks before your controller can communicate with
PanelView terminals over an EtherNet/IP network:
• Set the IP addresses for the EtherNet/IP communication module for the
controller and the HMI terminal.
• Connect all wiring and cabling.

Connections to PanelView
Terminals

To establish communication between a PanelView or PanelView Plus terminal,
specify controller connections.
Table 23 - PanelView Terminal Connections
Terminal Type
Type of Communication

PanelView

PanelView Plus

Implicit (connected)

Supported

Not supported

Supported

Supported

• Logix controller communicates to the PanelView terminal like
an I/O module.
• You must add the PanelView terminal to the I/O configuration
tree for the controller project.
Explicit (unconnected)
• PanelBuilder® or RSView® ME software configures
communication.
• The PanelView or PanelView Plus terminal initiates all
communication.

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When communicating implicitly (PanelView terminals only), the controller
uses one connection for each terminal. Account for these connections when
designing the system. Logix5000 controllers support these numbers of
connections:
• Firmware revisions 11 and earlier support up to 16 bidirectional implicit
buffers (connections).
• Firmware revisions 12 or later support up to 32 bidirectional implicit
buffers (connections).
The larger number of implicit buffers enables more PanelView terminals to
request data simultaneously from the controller via implicit communication.
When communicating explicitly, the controller supports 40 outgoing and 3
incoming buffers. This number of incoming buffers limits how many terminals
can simultaneously request data from a controller via explicit communication.
In other words, while a system can have multiple terminals, only three
terminals can explicitly request data from a Logix controller simultaneously.

Add a PanelView Terminal

To add a PanelView terminal, follow these steps.
1. In the Controller Organizer, right-click I/O Configuration and choose
New Module.

The Select Module dialog box appears.

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2. Click the By Category tab.
3. Choose your EtherNet/IP communication module and click OK.

Depending on the EtherNet/IP communication module, the Select
Major Revision dialog box can appear. If the dialog box appears, choose
the major revision of the module and click OK.
The New Module dialog box appears.

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4. Configure your new module.
• In the Name field, type the name of your module.
• In the IP Address field, type the module IP address.
• In the Slot field, type the chassis slot number.
• Click Change to configure these parameters:
– Module Revision
– Electronic Keying
– Communication Format
5. Click OK.

IMPORTANT

The number and type of configuration parameters on the New
Module dialog box varies according to the EtherNet/IP
communication module type.

6. In the Controller Organizer, right-click the local EtherNet/IP
communication module that you just added and choose New Module.

The Select Module Type dialog box appears.

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7. Click the By Category tab.
8. Choose the EtherNet/IP PanelView terminal and click OK.

The Module Properties dialog box appears.
9. Configure the PanelView terminal.
• In the Name field, type the name of your new module.
• From the Comm Format pull-down menu, choose Data-DINT.
• From the Electronic Keying pull-down menu, choose Disable
Keying.
• In the IP Address field, type the IP address.
• In the Input and Output fields, type the connection parameters.

IMPORTANT

You can establish up to eight different instances with each
terminal. For example, one controller can use all eight
instances or eight controllers can each use one instance.

10. Click Finish.

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Organize Controller Data for
a PanelView Terminal

Chapter 7

Organize data for a PanelView terminal based on how the data is used.
Table 24 - Controller Data Organization
For data that is

Do this

Time critical (for example, data
that controls a machine)

Use the I/O tags of the terminal.
The tags for this data were created when you added the terminal to the I/O
configuration of the controller. They resemble the tags of the I/O modules.

Not time critical

Create arrays to store the data.
1. For each screen, create a BOOL array with enough elements for the bitlevel objects on the screen.
For example, the BOOL[32] array gives you 32 bits for push buttons or
indicators.
2. For each screen, create a DINT array with enough elements for the wordlevel objects on the screen.
For example, the DINT[28] array provides 28 values for numeric entry
controls or numeric displays.

To access the I/O tags of the PanelView or PanelView Plus terminal, use the
following address format.

Connections to FactoryTalk
View Applications

Terminal Function

Requirement

Writes the data

name_of_terminal:I.Data[x].y

Reads the data

name_of_terminal:O.Data[x].y

This address variable

Is

name_of_terminal

Name of the instance in the I/O configuration of the controller.

x

Element of the input (I) or output (O) structure.

y

Bit number within the input or output element.

To establish communication to a FactoryTalk View application, configure
RSLinx® software to collect tags from the controller. A FactoryTalk View or
FactoryTalk View Enterprise application uses RSLinx software as a data server.
RSLinx Enterprise software defaults to four read connections and one write
connection per configured controller. Modify the RSLinx software
configuration as needed.

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8

Diagnostic Web Pages

This chapter describes the diagnostic web pages of a few representative
modules.
Topic

Page

Access Web Browser Support

106

1756-EN2TR Module

107

1756-ENBT Module

112

1756-EN2TP Module

116

1769-AENTR Adapter

121

The number and type of diagnostic fields vary by module catalog number. This
chapter describes the diagnostic web pages on these modules:
• 1756-EN2TR EtherNet/IP communication module
• 1756-ENBT EtherNet/IP communication module
• 1756-EN2TP EtherNet/IP communication module

IMPORTANT

The diagnostic web pages have many fields that you can use to monitor the
operating state of your EtherNet/IP module. This section describes only the
fields that are most commonly used during monitoring.
To troubleshoot problems, you diagnose as a result of monitoring the
diagnostic web pages of the EtherNet/IP modules, refer to
publication ENET-AT003, Troubleshoot EtherNet/IP Networks.

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Access Web Browser Support

To troubleshoot most possible problems with your EtherNet/IP
communication module, you must access the diagnostic web pages for the
module.
TIP

The number and type of diagnostic fields vary by module catalog number,
the programming software version, and module firmware revision.
For example, this chapter describes the diagnostic web pages for these
modules:
• 1756-EN2TR EtherNet/IP communication module
• 1756-ENBT EtherNet/IP communication module
• 1756-EN2TP EtherNet/IP Parallel Redundancy Protocol module

To access the EtherNet/IP communication module diagnostic web pages,
follow these steps.
1. Open your web browser.
2. In the Address field, type your EtherNet/IP communication module
Internet Protocol (IP) address and press Enter.
The diagnostic web home page appears.
EtherNet/IP Module Internet Protocol (IP) Address

3. Open the Diagnostics folder in the left-most navigation bar and click
the link for each diagnostic web page you must monitor.

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These pages are the most commonly used diagnostic web pages for the
1756-EN2TR module:
• Diagnostic Overview Page
• Ethernet Statistics Web Page
• Ring Statistics Web Page
TIP

The 1756-EN2TR module also offers these diagnostic web pages for
monitoring the module:
• Network Settings
• Application Connections
• Bridge Connections
These web pages are not as commonly used as the three described
in this section and are not described here.

Diagnostic Overview Page
The Diagnostic Overview web page presents a summary of the current
configuration and overall status of the module.
The most commonly monitored fields are circled in the graphic and described
in the table that follows.

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Table 25 describes the fields that are most commonly used on the Diagnostics
Overview web page.
Table 25 - Diagnostic Overview Web Page
Field

Specifies

Module Resource Utilization (All Ports)
CPU

Current percent CPU utilization for the module

CIP Connection Statistics (All Ports)
Active Total

Total number of active CIP connections used for both messaging and I/O

TCP Connections (EtherNet/IP Port)
Active

Number of active TCP connections for CIP messaging

HMI/MSG (EtherNet/IP Port)
Sent packets per second

Number of CIP messages sent in the last one-second snapshot

Received packets per
second

Number of CIP packets received in the last one-second snapshot

I/O and Prod/Cons Packets Per Second (EtherNet/IP Port)
Total

Total number CIP I/O packets that are sent and received

I/O and Prod/Cons Packets Count (EtherNet/IP Port)
Missed

108

Number of CIP I/O packets missed

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Chapter 8

Ethernet Statistics Web Page
The Ethernet Statistics web page provides a summary of the status of
communication activity on the Ethernet network.
The most commonly monitored fields are circled in the graphic and described
in Table 26.

Table 26 describes the field that is most commonly used on the Ethernet
Statistics web page.
Table 26 - Ethernet Statistics Web Page
Field

Specifies

Ethernet Port 1 (These definitions apply to the same fields in the Ethernet Port 2 section.)
Interface State

Whether the port is turned off or on. Active or inactive indicates whether there is a cable connected.

Link Status

Whether the port is blocked for DLR protocol frames.

Speed

Whether the Ethernet port is operating at 10 MBps or 100 MBps.

Duplex

Whether the Ethernet port is operating at half-duplex or full-duplex.

Autonegotiate Status

Whether the port speed and Duplex mode were determined via autonegotiation or whether they were manually configured.

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Table 26 - Ethernet Statistics Web Page (Continued)
Field

Specifies

Media Counters Port 1
Alignment Errors

A frame containing bits that do not total an integral multiple of eight.

FCS Errors

A frame that contains eight bits, at least one of which has been corrupted.

Single Collisions

The number of outgoing packets that encountered only one collision during transmission.

Multiple Collisions

The number of outgoing packets that encountered 2...15 collisions during transmission.

SQE Test Errors

A test to detect the collision-present circuit between a transceiver and a network interface card (NIC).
IMPORTANT: Because most NICs now have an integrated transceiver, the SQE test is unnecessary. Ignore this media counter.

Deferred Transmissions

The number of outgoing packets whose transmission is deferred because the network is busy when the first attempt is made to
send them.

Late Collisions

The number of times two devices transmit data simultaneously.

Excessive Collisions

The number of frames that experience 16 consecutive collisions.

MAC Transmit Errors

Frames for which transmission fails due to an internal MAC sublayer transmit error.

Carrier Sense Errors

Times that the carrier sense condition was lost or never asserted when attempting to transmit a frame.

Frame Too Long

The number of incoming packets that exceed the maximum Ethernet packet size.

MAC Receive Errors

Frames for which reception on the Ethernet interface failed due to an internal MAC sublayer receive error.

Connection Manager Cmd Object Info Web Page
The Connection Manager Cmd Object Info link provides a summary of
connection request activity on the Ethernet network.

The most commonly used field on this web page is Connections Closed due
to a Timeout. This field shows the number of CIP connection timeouts that
have occurred on the module.

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Chapter 8

Ring Statistics Web Page
TIP

The Ring Statistics web page, and the descriptions in this section, only apply
to modules you can use in a Device Level Ring (DLR) network:
• 1756-EN2TR communication module
• 1756-EN3TR communication module

The Ring Statistics web page provides a summary of the operating state of the
module in a DLR application.
The most commonly monitored fields are circled in the graphic and described
in Table 27.

Table 27 describes the field that is most commonly used on the Ring Statistics
web page.
Table 27 - Ring Statistics Web Page
Field

Specifies

Ring Supervisor
Ring Supervisor Mode

Whether a module is configured to function as supervisor node or a ring node.

Ring Supervisor Status

Whether a module that is configured to function as a supervisor node is functioning as the active ring supervisor or a backup
supervisor node.

Ring Fault Location
Last Active Node on Port 1

The IP or MAC ID address of the last active node between port 1 on the module and the faulted part of the network.

Last Active Node on Port 2

The IP or MAC ID address of the last active node between port 2 on the module and the faulted part of the network.

Active Ring Supervisor
Address

The IP or MAC ID address of the active ring supervisor.

Precedence

The precedence value of the module. If the operation of the active supervisor node is interrupted, the backup supervisor with
the next highest precedence value becomes the active supervisor node.

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1756-ENBT Module

These pages are the most commonly used diagnostic web pages for the
1756-ENBT module:
• Diagnostic Overview Page
• Ethernet Statistics
TIP

The 1756-ENBT module also offers these diagnostic web pages for
monitoring the module:
• Network Settings
• Message Connections
• I/O Connections
These web pages are not as commonly used as the three described
in this section and are not described here.

Diagnostic Overview Page
The Diagnostic Overview web page presents a summary of the current
configuration and overall status of the module. The most commonly
monitored fields are circled in the graphic and described in Table 28.

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Table 28 - Diagnostic Overview Web Page
Field

Specifies

Ethernet Link
Speed

Whether the Ethernet port is operating at 10 Mbps or 100 Mbps.

Duplex

Whether the Ethernet port is operating at half-duplex or full-duplex.

Autonegotiate Status

Whether the port speed and duplex mode were determined via autonegotiation or manual configuration.

System Resource Utilization
CPU

Number of times a page has been requested for which you have insufficient privilege.
Current percent CPU utilization for the module.

CIP Connection Statistics
Current CIP MSG Connections

Current number of CIP connections for message.

Current CIP I/O Connections

Current number of CIP connections for I/O.

Conn Timeouts

Number of CIP connection timeouts.

TCP Connections (CIP)
Current TCP Connections

Current number of active TCP connections for CIP messaging.

I/O Packet / Second Statistics
Total

Total number of Class 1 UDP packets the module transmitted and received in the last one-second snapshot.
The Total is the sum of the Sent, Received, Inhibited, and Rejected numbers.

I/O Packet Counter Statistics
Missed

Cumulative number packets that were not received in order.
Each UDP packet has a sequence number and if a packet is missing (corrupted or dropped), the module will recognize this void
upon receipt of the next packet received.

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Ethernet Statistics
The Ethernet Statistics diagnostic web page presents a summary of the status of
communication activity on the Ethernet network.
The most commonly monitored fields are circled in the graphic and described
in Table 29.

Table 29 - Ethernet Statistics Web Page
Field

Specifies

Ethernet Link
Speed

Whether the Ethernet port is operating at 10 MBps or 100 MBps.

Duplex

Whether the Ethernet port is operating at half-duplex or full-duplex.

Autonegotiate Status

Whether the port speed and Duplex mode were determined via autonegotiation or whether they were manually
configured.

Media Counters
Alignment Errors

A frame containing bits that do not total an integral multiple of eight.

FCS Errors

A frame that contains eight bits, at least one of which has been corrupted.

Single Collisions

The number of outgoing packets that encountered only one collision during transmission.

Multiple Collisions

The number of outgoing packets that encountered 2...15 collisions during transmission.

SQE Test Errors

A test to detect the collision-present circuit between a transceiver and a network interface card (NIC).
Important: Because most NICs now have an integrated transceiver, the SQE test is unnecessary. Ignore this media
counter.

Deferred Transmissions

The number of outgoing packets whose transmission is deferred because the network is busy when the first attempt
is made to send them.

Media Counters
Late Collisions

114

The number of times two devices transmit data simultaneously.

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Chapter 8

Table 29 - Ethernet Statistics Web Page (Continued)
Field

Specifies

Excessive Collisions

The number of frames that experience 16 consecutive collisions.

MAC Transmit Errors

Frames for which transmission fails due to an internal MAC sublayer transmit error.

Carrier Sense Errors

Times that the carrier sense condition was lost or never asserted when attempting to transmit a frame.

Frame Too Long

The number of incoming packets that exceed the maximum Ethernet packet size.

MAC Receive Errors

Frames for which reception on the Ethernet interface failed due to an internal MAC sublayer receive error.

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1756-EN2TP Module

These pages are the most commonly used diagnostic web pages for the
1756-EN2TP module:
• Diagnostic Overview Page
• Ethernet Statistics Web Page
• PRP Statistics
• PRP Nodes
TIP

The 1756-EN2TP module also offers these diagnostic web pages for
monitoring the module:
• Network Settings
• Application Connections
• Bridge Connections
These web pages are not as commonly used as the three described
in this section and are not described here.

Diagnostic Overview
The Diagnostic Overview web page presents a summary of the current
configuration and overall status of the module.

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Chapter 8

Table 30 describes the fields that are most commonly used on the Diagnostics
Overview web page.
Table 30 - 1756-EN2TP Communcation Module Diagnostic Overview
Field

Specifies

Module Resource Utilization (All Ports)
CPU

Current percent CPU utilization for the module

CIP Connection Statistics (All Ports)
Active Total

Total number of active CIP connections used for both messaging and I/O

TCP Connections (EtherNet/IP Port)
Active

Number of active TCP connections for CIP messaging

HMI/MSG (EtherNet/IP Port)
Sent packets per second

Number of CIP messages sent in the last one-second snapshot

Received packets per second

Number of CIP packets received in the last one-second snapshot

I/O and Prod/Cons Packets Per Second (EtherNet/IP Port)
Total

Total number CIP I/O packets that are sent and received in the last one-second snapshot.

I/O and Prod/Cons Packets Count (EtherNet/IP Port)
Missed

Number of CIP I/O packets missed

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Ethernet Statistics
The Ethernet Statistics diagnostic web page presents a summary of the status of
communication activity on the Ethernet network.

Table 31 describes the fields that are most commonly used on the Ethernet
Statistics web page.
Table 31 - 1756-EN2TP Communcation Module Ethernet Statistics
Field

Specifies

Ethernet Port A and B
Interface State

Whether the interface for the port is enabled.

Link Status

Whether the link is active or not.

Speed

Whether the Ethernet port is operating at 10 MBps or 100 MBps.

Duplex

Whether the Ethernet port is operating at half-duplex or full-duplex.

Autonegotiate Status

Whether the port speed and Duplex mode were determined via autonegotiation or whether they were manually
configured.

Media Counters, Port A and B

118

Alignment Errors

A frame containing bits that do not total an integral multiple of eight.

FCS Errors

A frame that contains eight bits, at least one of which has been corrupted.

Single Collisions

The number of outgoing packets that encountered only one collision during transmission.

Multiple Collisions

The number of outgoing packets that encountered 2...15 collisions during transmission.

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Chapter 8

Table 31 - 1756-EN2TP Communcation Module Ethernet Statistics (Continued)
Field

Specifies

SQE Test Errors

A test to detect the collision-present circuit between a transceiver and a network interface card (NIC).
Important: Because most NICs now have an integrated transceiver, the SQE test is unnecessary. Ignore this media
counter.

Deferred Transmissions

The number of outgoing packets whose transmission is deferred because the network is busy when the first attempt
is made to send them.

Late Collisions

The number of times two devices transmit data simultaneously.

Excessive Collisions

The number of frames that experience 16 consecutive collisions.

MAC Transmit Errors

Frames for which transmission fails due to an internal MAC sublayer transmit error.

Carrier Sense Errors

Times that the carrier sense condition was lost or never asserted when attempting to transmit a frame.

Frame Too Long

The number of incoming packets that exceed the maximum Ethernet packet size.

MAC Receive Errors

Frames for which reception on the Ethernet interface failed due to an internal MAC sublayer receive error.

PRP Statistics Tab
The most commonly monitored fields are circled in the graphic and described
in the table that follows.
Figure 12 - 1756-EN2TP PRP Module Diagnostics

Table 32 describes the fields that are most commonly used on the Ethernet
Statistics web page.
Table 32 - 1756-EN2TP Communication Module PRP Statistics
Field

Specifies

Counters Port A and B
Transmit Count

Number of PRP-tagged frames that are transmitted over each LAN since the last Reset Counters operation or powerup.

Receive Count

Number of PRP-tagged frames that are received on each LAN since the last Reset Counters operation or powerup.

Warning Count

A potential issue with the PRP ports exists.
Count increments every time Active transitions from False to True.

Warning Active

Active is True when no PRP packets received on this LAN in the previous 3 seconds, or if an entry in the PRP nodes table has
False in the corresponding Receiving on Port A/B column.

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PRP Nodes Tab
The most commonly monitored fields are circled in the graphic and described
in the table that follows. Any node that the 1756-EN2TP module
communicates with displays on the PRP Nodes tab, including DANs, SANs,
RedBoxes, and VDANs.
Figure 13 - 1756-EN2TP PRP Nodes

The fields to monitor are Receiving on Port A and B. If either of those fields are
False, it is indicative of a loss of PRP redundancy. Some IP addresses can display
as 0.0.0.0. An IP address displayed as 0.0.0.0 is an indication that the device is
not communicating directly with that device.

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1769-AENTR Adapter

Chapter 8

These pages are the most commonly used diagnostic web pages for the
1769-AENTR adapter:
• Diagnostic Overview Page
• Ethernet Statistics
TIP

The 1769-AENTR adapter also offers these diagnostic web pages for
monitoring the adapter:
• Network Settings
• I/O Connections
These web pages are not as commonly used as the two described in
this section and are not described here.

Diagnostic Overview Page
The Diagnostic Overview web page presents a summary of the current
configuration and overall status of the adapter. The most commonly
monitored fields are circled in the graphic and described in Table 33.

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Ethernet Statistics
Table 33 - Diagnostic Overview Web Page
Field

Specifies

Ring Status
Network Topology

Whether the Ethernet network is linear or DLR topology.

Network Status

Whether the Ethernet network is operating normally or otherwise.

Ring Supervisor

The IP and MAC ID of the ring supervisor.

Beacon Interval

Beacon interval values. These values affect network recovery time. Use default values unless the ring includes more than 50
devices. For more information, see the EtherNet/IP Embedded Switch Technology Application Guide, publication ENET-AP005.

Beacon Timeout

Beacon timeout values. These values affect network recovery time. Use default values unless the ring includes more than 50
devices. For more information, see the EtherNet/IP Embedded Switch Technology Application Guide, publication ENET-AP005.

System Resource Utilization
CPU

Number of times a page has been requested for which you have insufficient privilege.
Current percent CPU utilization for the module.

CIP Connection Statistics
Current CIP MSG Connections

Current number of CIP connections for message.

Current CIP I/O Connections

Current number of CIP connections for I/O.

Conn Timeouts

Number of CIP connection timeouts.

TCP Connections (CIP)
Active

122

Current number of active TCP connections for CIP messaging.

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Diagnostic Web Pages

Chapter 8

The Ethernet Statistics diagnostic web page presents a summary of the status of
communication activity on the Ethernet network.
The most commonly monitored fields are described in Table 34.

Table 34 - Ethernet Statistics Web Page
Field

Specifies

Ethernet Port 1 (These definitions apply to the same fields in the Ethernet Port 2 section.)
Interface State

Whether the port is turned off or on. Active or inactive indicates whether there is a cable connected.

Link Status

Whether the port is blocked for DLR protocol frames.

Speed

Whether the Ethernet port is operating at 10 MBps or 100 MBps.

Duplex

Whether the Ethernet port is operating at half-duplex or full-duplex.

Autonegotiate Status

Whether the port speed and Duplex mode were determined via autonegotiation or whether they were manually
configured.

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Table 34 - Ethernet Statistics Web Page (Continued)
Field

Specifies

Media Counters Port 1

124

Alignment Errors

A frame containing bits that do not total an integral multiple of eight.

FCS Errors

A frame that contains eight bits, at least one of which has been corrupted.

Single Collisions

The number of outgoing packets that encountered only one collision during transmission.

Multiple Collisions

The number of outgoing packets that encountered 2...15 collisions during transmission.

SQE Test Errors

A test to detect the collision-present circuit between a transceiver and a network interface card (NIC).
IMPORTANT: Because most NICs now have an integrated transceiver, the SQE test is unnecessary. Ignore this media
counter.

Deferred Transmissions

The number of outgoing packets whose transmission is deferred because the network is busy when the first attempt
is made to send them.

Late Collisions

The number of times two devices transmit data simultaneously.

Excessive Collisions

The number of frames that experience 16 consecutive collisions.

MAC Transmit Errors

Frames for which transmission fails due to an internal MAC sublayer transmit error.

Carrier Sense Errors

Times that the carrier sense condition was lost or never asserted when attempting to transmit a frame.

Frame Too Long

The number of incoming packets that exceed the maximum Ethernet packet size.

MAC Receive Errors

Frames for which reception on the Ethernet interface failed due to an internal MAC sublayer receive error.

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Appendix

A

1756 EtherNet/IP Status Indicators

This graphic shows the front of the module for these modules (extendedtemperature versions not shown).

LINK NET

OK

Dual-port
Module

Single-port
Module

LNK1 LNK2 NET OK

LINK

NET

OK

LNK1 LNK2 NET OK

LINK

NET

OK

Single-port
Module

2

1

1

Dual-port
Module
32453

32452

1756-EN2TP

32730

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1756 EtherNet/IP Status Indicators

Table 35 - Single-port Module Status Indicators
Status Indicator

Description

Status

State

Module Status Display

Alphanumeric display that scrolls messages. For example,
when a module is operating normally, the display scrolls
the module’s IP address.

N/A

N/A

Link Status (LINK)

Indicates the module’s current state with respect to
transmitting data on the EtherNet/IP network.

Off

One of these conditions exists:
• The module is not powered.
– Verify there is chassis power.
– Verify that the module is completely inserted
into the chassis and backplane.
– Make sure the module has been configured.
• No link exists on the port.

OK Status (OK)

Network Status (NET)

128

Indicates the module’s current state. For example, this
status indicator indicates if the module is executing
power-up testing, in the process of a firmware update or
operating normally.

Indicates if CIP connections are established.

Flashing green

Activity exists on the port.

Green

Activity exists on the port.

Off

The module is not powered.
• Verify there is chassis power.
• Verify that the module is completely inserted into
the chassis and backplane.
• Make sure the module has been configured.

Flashing green

The module is not configured. The Module Status
display scrolls: BOOTP or
DHCP
For example: BOOTP 00:0b:db:14:55:35
Configure the module.

Green

The module is operating correctly. The module’s IP
address scrolls across the Module Status display.

Flashing red

The module detected a recoverable minor fault. Check
the module configuration. If necessary, reconfigure
the module.

Red

The module detected an unrecoverable major fault.
Cycle power to the module. If this does not clear the
fault, replace the module.

Off

One of these conditions exists:
• The module is not powered.
– Verify there is chassis power.
– Verify that the module is completely inserted
into the chassis and backplane.
– Make sure the module has been configured.
• The module is powered but does not have an IP
address. Assign an IP address to the module.

Flashing green

The controller has an IP address and one of these
conditions exists:
• The module has not established any CIP
connections.
If connections are configured for this module,
check the connection originator for the connection
error code.
• One or more connections have timed out. For
example, an HMI or I/O connection has timed out.
Reestablish the connection.

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Appendix A

Table 35 - Single-port Module Status Indicators
Status Indicator

Description

Status

State

Network Status (NET)

Indicates if CIP connections are established.

Green

The module has established at least 1 CIP connection
and is operating properly. The module’s IP address
scrolls across the Module Status display.

Red

The module is in conflict mode. It shares an IP address
with another device on the network. The module’s
current IP address scrolls across the Module Status
display. The display scrolls: OK
 Duplicate IP

For example: OK 10.88.60.196 Duplicate IP 00:00:BC:02:34:B4
Change the module’s IP address.

Flashing green/flashing
red

The module is performing its power-up testing.

Table 36 - Dual-port Module Status Indicators
Status Indicator

Description

Status

State

Module Status Display

Alphanumeric display that scrolls messages. For
example, when a module is operating normally, the
display scrolls the module’s IP address.

N/A

N/A

OK

Indicates the module’s current state. For example,
this status indicator indicates if the module is
executing power-up testing, in the process of a
firmware update or operating normally.

Off

The module is not powered.
• Verify there is chassis power.
• Verify that the module is completely inserted into the chassis
and backplane.
• Make sure the module has been configured.

Flashing green

The module is not configured. The Module Status display scrolls:
BOOTP or DHCP
For example: BOOTP 00:0b:db:14:55:35
Configure the module.

Green

The module is operating correctly. The Module Status display
scrolls: OK 
For example: OK 10.88.60.160

Flashing red

The module detected a recoverable minor fault. Check the
module configuration. If necessary, reconfigure the module.

Red

The module detected an unrecoverable major fault. Cycle power
to the module. If this does not clear the fault, replace the
module.

Both of these
conditions exist:
• Status Indicator is
Red
• Module Status
Display is scrolling:
Image Update
Needed

The module’s main firmware image needs to be updated. Follow
these steps:
1. Update the firmware image.
2. Cycle power to the module.
3. If the status indicators remain the same, that is, red and
scrolling Image Update Needed, replace the module.

Flashing red and green

The module is performing its power-up testing.

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Table 36 - Dual-port Module Status Indicators
Status Indicator

Description

Status

State

Network Status (NET)

Indicates if CIP connections are established.
IMPORTANT: The new-series 1756-EN2TR and
1756-EN3TR modules have a NET status indicator.
The older-series 1756-EN2TR and 1756-EN3TR
modules do not have a NET status indicator.

Off

One of these conditions exists:
• The module is not powered.
– Verify there is chassis power.
– Verify that the module is completely inserted into the
chassis and backplane.
– Make sure the module has been configured.
• The module is powered but does not have an IP address.
Assign an IP address to the module.

Flashing green

The controller has an IP address and one of these conditions
exists:
• The module has not established any CIP connections.
If connections are configured for this module, check the
connection originator for the connection error code.
• One or more connections have timed out. For example, an
HMI or I/O connection has timed out.
Reestablish the connection.

Green

The module has established at least 1 CIP connection and is
operating properly. The module’s IP address scrolls across the
Module Status display.

Red

The module is in conflict mode. It shares an IP address with
another device on the network. The module’s current IP address
scrolls across the Module Status display. The display scrolls: OK
 Duplicate IP

For example: OK 10.88.60.196 Duplicate IP - 00:00:BC:02:34:B4
Change the module’s IP address.

Flashing green/
flashing red

The module is performing its power-up testing.

Off

One of these conditions exists:
• The module is not powered.
– Verify there is chassis power.
– Verify that the module is completely inserted into the
chassis and backplane.
– Make sure the module has been configured.
• No link exists on the port.
• The port is administratively disabled (LNK2).
• The port is disabled due to rapid ring faults (LNK2).

Flashing green

Activity exists on the port.

Green

One of these conditions exists:
• A link exists on the port.
• The ring network is operating normally on active ring
supervisor (LNK2).
• A ring partial network fault was detected on the active ring
supervisor (LNK2).

Flashing red

When the corresponding LAN A/B Parallel Redundancy Protocol
(PRP) Warning bit is set.

LINK 1 (3)
LINK 2 (4)

LAN A
LAN B

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Numerics
1756 module
status indicators 127

A
access distributed I/O modules 52, 53
add distributed I/O modules
overview 42, 44
selecting a remote adapter 50
with Studio 5000 Logix Designer application
53

B
BOOTP/DHCP server
setting IP network address 20 … 22

C
communication driver 14 … 15
communication format 45, 50
direct connections 47
ownership 49, 50
rack-optimized connections 48
configure
DHCP server 22
EtherNet/IP modules 17 … 30
MSG instructions 86
personal computer 13 … 15
RSLinx software 24 … 25
Studio 5000 Logix Designer application 26
connections
data transfer 67
I/O 45
interlocking 57
messaging 67
produced and consumed tags 57
to PanelView terminals 98
to RSView applications 103
consume tags 57, 61, 65
control application 30
control I/O
adding distributed I/O modules 42, 44
communication format 45, 50
connections 45
hardware 41
ownership 49
RPI 51
control system 11
controller ownership 49
convert between INTs and DINTs 75

D
data transfer
configuring 71, 74
connections 67
guidelines 66
logic 68
mapping tags 76
overview 55, 78
to PLC-5 or SLCcontrollers 75
DHCP server 22
diagnostics
Ethernet statistics 114, 122
monitor 105
overview 107, 109, 110, 111, 112, 116,
118, 121
direct connection 45
DNS addressing 29 … 30
domain name 18
download 30
driver 14 … 15
dually attached node 36
duplicate address detection 27 … 28

E
electronic keying 33
email
MSG instruction 86
overview 79
send through an EtherNet/IP module 79 …
95
sending via MSG instruction 81 … 87
status codes 94
text format 94
EtherNet/IP modules
configuring 17 … 30
control application 30
overview 11
set IP network address 18
using in control system 11

G
gateway 17

H
host name 18
Hot Standby Router Protocol 36

I
I/O
controlling over EtherNet/IP 41

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Index

interlocking
connections 57
consume tags 61, 65
organize tags 57
overview 55, 78
produce tags 59, 60
terminology 57
IP addresses
definition 17
DHCP server 22
duplicate address detection 27 … 28
RSLinx software 24 … 25
set 18
Studio 5000 Logix Designer application 26
swapping in redundant systems 28

K
keying, electonic 33

M
map tags 76
messaging
configuring 71, 74
connections 67
guidelines 66
logic 68
data transfer 70
mapping tags 76
overview 55, 78
to PLC-5 or SLCcontroller 75
MSG instruction
configuring 71, 74
connections 67
guidelines 66
logic 68, 70
mapping tags 76
sending email 86
sending via an email 81 … 87
to PLC-5 or SLC controllers 75

P
PanelView terminals
adding in Studio 5000 Logix Designer
application 99 … 102
communicating with Logix5000 controller
over an EtherNet/IP network 97
… 103
determining connections 98
organizing controller data 103
set up hardware 97
Parallel Redundancy Protocol 36
personal computers
placing on network 13 … 15
PLC-2 controller 67
PLC-3 controller 67
PLC-5 controller 75
produce tags 57, 59, 60
produced and consumed tags
connections 57
consume tags 61, 65
organize tags 57
overview 55, 78
produce tags 59, 60
set up hardware 56
terminology 57
programming software
set IP network address 18

R
rack-optimized connection 45
RedBox 36, 38
remote adapter 50
requested packet interval 51, 52
RPI 51
RSLinx software
communication driver 14 … 15
configuring network parameters 24 … 25
setting IP network address 18

N
network address
DNS addressing 29 … 30
set IP network address 18
network overview
modules in an EtherNet/IP control system 11
network parameters
DNS addressing 18
domain name 18
gateway 17
host name 18
IP addresses 17
subnet mask 17

O
ownership 49
listen-only connection 49
owner controller 49

132

S
select a remote adapter 50
set IP network address 18
BOOTP/DHCP server 20 … 22
RSLinx software or programming software
18
thumbwheel switch 18
set the requested packet interval
with Studio 5000 Logix Designer application
51, 52
set up hardware
data transfer 56
I/O modules over EtherNet/IP 41
interlocking 56
messaging 56
PanelView terminals and Logix5000
controllers 97
produced and consumed tags 56
set up I/O
controlling I/O 41

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

Index

single attached node 36
SLC controller 75
status codes
email 94
status indicators
1756 module 127
string tags 81
Studio 5000 Logix Designer application
adding a PanelView terminal 99 … 102
adding distributed I/O modules 42, 53
consume a tag 61, 65
produce a tag 59, 60
set the requested packet interval 51, 52
setting IP network address 18
software
adding distributed I/O modules 44
subnet mask 17
swap IP addresses 28

T
thumbwheel switch
set IP network address 18
troubleshoot
web browser support 106

V
virtual DAN 36

W
web browser support 106

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

133

Index

Notes:

134

Rockwell Automation Publication ENET-UM001P-EN-P - August 2017

.

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Allen-Bradley, Compact I/O, CompactLogix, ControlLogix, DH+, DriveLogix, FactoryTalk, FLEX, Logix5000, PanelBuilder, PanelView, PLC-2, PLC-3, PLC-5, POINT I/O, PowerFlex, Rockwell Automation, Rockwell Software, RSLinx, RSLogix,
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Publication ENET-UM001P-EN-P - August 2017
Supersedes Publication ENET-UM001O-EN-P - May 2016

Copyright © 2017 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.

EtherNet/IP Network Configuration

User Manual



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