VersaMax System Genius Network Interface Unit User's Manual, GFK 1535A Gfk1535a GENIUSNIUMODULE

User Manual: GFK-1535A

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GE Fanuc Automation
Programmable Control Products

VersaMax™ System
Genius® Network Interface Unit
User's Manual
GFK-1535A

November 2000

GFL-002

Warnings, Cautions, and Notes
as Used in this Publication
Warning
Warning notices are used in this publication to emphasize that hazardous
voltages, currents, temperatures, or other conditions that could cause
personal injury exist in this equipment or may be associated with its use.
In situations where inattention could cause either personal injury or
damage to equipment, a Warning notice is used.

Caution
Caution notices are used where equipment might be damaged if care is not
taken.

Note
Notes merely call attention to information that is especially significant to
understanding and operating the equipment.
This document is based on information available at the time of its publication. While efforts have
been made to be accurate, the information contained herein does not purport to cover all details or
variations in hardware or software, nor to provide for every possible contingency in connection
with installation, operation, or maintenance. Features may be described herein which are not
present in all hardware and software systems. GE Fanuc Automation assumes no obligation of
notice to holders of this document with respect to changes subsequently made.
GE Fanuc Automation makes no representation or warranty, expressed, implied, or statutory with
respect to, and assumes no responsibility for the accuracy, completeness, sufficiency, or usefulness of
the information contained herein. No warranties of merchantability or fitness for purpose shall apply.
The following are trademarks of GE Fanuc Automation North America, Inc.
Alarm Master
CIMPLICITY
CIMPLICITY 90–ADS
CIMSTAR
Field Control
GEnet

Genius
Helpmate
Logicmaster
Modelmaster
Motion Mate
PowerMotion

PowerTRAC
ProLoop
PROMACRO
Series Five
Series 90
Series One

Series Six
Series Three
VersaMax
VersaPro
VuMaster
Workmaster

Contents
Chapter 1

Introduction............................................................................................ 1-1
Related Manuals.................................................................................................. 1-2
The VersaMax Family of Products ................................................................... 1-3
The VersaMax Genius I/O Station ....................................................................... 1-4
The Genius NIU.................................................................................................. 1-5
Genius NIU Specifications .................................................................................. 1-6
Power Supplies ................................................................................................... 1-7
I/O Modules........................................................................................................ 1-8
Carriers............................................................................................................. 1-11
Expansion Modules ........................................................................................... 1-13
VersaMax General Product Specifications ......................................................... 1-15

Chapter 2

Installation.............................................................................................. 2-1
Module Clearance ............................................................................................... 2-2
Thermal Considerations....................................................................................... 2-3
Mounting Instructions ......................................................................................... 2-4
Panel-Mounting .................................................................................................. 2-5
Installing an Expansion Transmitter Module ........................................................ 2-6
Installing an Expansion Receiver Module ............................................................ 2-7
Installing Power Supply Modules ...................................................................... 2-10
Installing Additional Modules............................................................................ 2-11
Setting the SBA and Baud Rate ......................................................................... 2-12
Special Switch Settings on the NIU ................................................................... 2-13
Selecting a Cable Type ...................................................................................... 2-15
Bus Length........................................................................................................ 2-17
Making Bus Connections................................................................................... 2-18
Observing the LEDs .......................................................................................... 2-20
CE Mark Installation Requirements ................................................................... 2-21

Chapter 3

Operation................................................................................................ 3-1
NIU Data Memories ............................................................................................ 3-2
Scanning Inputs and Outputs in the I/O Station .................................................... 3-3
Data Transfer Between the NIU and the Bus ........................................................ 3-4
Genius Bus Scan Time ........................................................................................ 3-7

Chapter 4

Configuring a Genius NIU and I/O Station........................................... 4-1
Using Autoconfiguration or Programmer Configuration ....................................... 4-2
Configuring “Racks” and “Slots”......................................................................... 4-3
Software Configuration of the Genius NIU and I/O Station .................................. 4-5

GFK-1535A

iii

Contents
Autoconfiguration of the Genius NIU and I/O Station ........................................ 4-10
How Autoconfiguration Handles Equipment Changes........................................ 4-13

Chapter 5

Datagrams .............................................................................................. 5-1
Datagram Types .................................................................................................. 5-2
Read Map ........................................................................................................... 5-3
Read Map Reply.................................................................................................. 5-3
Report Fault Datagram Format ............................................................................ 5-4
Configuration Data.............................................................................................. 5-6
Set NIU Operating Mode................................................................................... 5-20

Chapter 6

Redundancy............................................................................................ 6-1
CPU/Bus Controller Redundancy......................................................................... 6-2
Using the NIU in a Genius Bus Redundancy System ............................................ 6-3

Appendix A

Operation of the Genius Bus..................................................................A-1
Electrical Interface ..............................................................................................A-2
Serial Bus Waveforms.........................................................................................A-3
Maximum Bus Length.........................................................................................A-4
Serial Data Format ..............................................................................................A-6
Genius Transceiver Electrical Specification .........................................................A-7
Bus Errors...........................................................................................................A-7

Appendix B

Performance Data ..................................................................................B-1

VersaMax™ System Genius® Network Interface Unit User's Manual– November 2000

GFK-1535A

Chapter

Introduction

1
This manual explains how to install and use a VersaMax™ Genius® Network
Interface Unit module to interface VersaMax I/O modules to a Genius bus.
NIU installation procedures are described in Chapter 2.
NIU operation is described in chapter 3. This chapter explains how the NIU
interacts with the modules in its station, how it stores data, and how it exchanges
data with the system host.
Configuration is described in chapter 4.
The datagrams that can be sent to an NIU are described in chapter 5.
Genius Bus and CPU Redundancy options are explained in chapter 6.
Bus operation is detailed in appendix A.
Appendix B lists I/O module scan time performance data.

GFK-1535A

1-1

1
Related Manuals

1-2

VersaMax Modules, Power Supplies,
and Carriers User’s Manual (catalog
number GFK-1504)

Describes the many VersaMax I/O and option
modules, power supplies, and carriers. This
manual also provides detailed system
installation instructions.

Remote I/O Manager User’s Guide
(catalog number GFK-1847).

Gives step-by-step instructions for using the
Remote I/O Manager configuration software.

VersaMax Ethernet Network Interface
Unit User’s Manual (catalog number
GFK-1860)

Describes the installation and operation of the
Ethernet Network Interface Unit module.

VersaMax DeviceNet Communications
Modules User’s Manual (catalog
number GFK-1533)

Describes the installation and operation of the
DeviceNet Network Interface Unit module and
the DeviceNet Network Slave Module.

VersaMax Profibus Communications
Modules User’s Manual (catalog
number GFK-1534)

Describes the installation and operation of the
Profibus Network Interface Unit module and
the Profibus Network Communications
Module.

VersaMax PLC User’s Manual (catalog
number GFK-1503)

Describes the installation and operation of the
VersaMax CPU.

Genius System and Communications
Manual (catalog number GEK-90486-1).

Provides detailed reference information about
Genius communications and message
formats.

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

1
The VersaMax Family of Products
The VersaMax family of products provides universally-distributed I/O that spans
PLC and PC-based architectures. Designed for industrial and commercial
automation, VersaMax I/O provides a common, flexible I/O structure for local and
remote control applications. The VersaMax PLC provides big-PLC power with a
full range of I/O and option modules. VersaMax I/O Stations with Network
Interface Modules make it possible to add the flexibility of VersaMax I/O to other
types of networks. VersaMax meets UL, CUL, CE, Class1 Zone 2 and Class I
Division 2 requirements.
As a scaleable automation solution, VersaMax I/O combines compactness and
modularity for greater ease of use. The 70-mm depth and small footprint of
VersaMax I/O enables easy, convenient mounting as well as space-saving benefits.
Modules can accommodate up to 32 points of I/O each.
The compact, modular VersaMax products feature DIN-rail mounting with up to
eight I/O and option modules per “rack” and up to 8 racks per VersaMax PLC or
VersaMax I/O Station system. Expansion racks can be located up to 750 meters
from the main VersaMax PLC or VersaMax I/O Station rack. Expansion racks can
include any VersaMax I/O, option, or communications module.
VersaMax provides automatic addressing that can eliminate traditional
configuration and the need for hand-held devices. Multiple field wiring termination
options provide support for two, three, and four-wire devices.
For faster equipment repair and shorter Mean-Time-To-Repair, the hot insertion
feature enables addition and replacement of I/O modules while a machine or process
is running and without affecting field wiring.

GFK-1535A

Chapter 1 Introduction

1-3

1
The VersaMax Genius I/O Station
A VersaMax PLC consists of a group of VersaMax modules with a VersaMax CPU
and attached power supply in the first position.
Genius NIU

VersaMax Modules

power supply

An I/O Station provides up to 64 analog channels and up to 1024 discrete points for
256 total bytes of I/O. The NIU operates as a device on a Genius bus, automatically
exchanging I/O, diagnostic, and control data with a PLC or host computer.

VersaMax I/O in a Genius System
An I/O station can be used on the same bus as Genius I/O blocks, Field Control I/O
stations, and Remote I/O drops.
Host Computer

Series 90-30 PLC with
bus controller module

Series 90-30 PLC with
communications module

PCIM

Genius Bus

NIU

NIU
Genius I/O Blocks
Series 90-70 Remote I/O Drop

NIU

Field Control™ I/O Station
VersaMax™ I/O Stations

VersaMax I/O stations can be used in redundant bus and redundant CPU
applications. The Genius NIU provides built-in bus-switching capability. See
chapter 6 for more information about using the NIU in a redundancy system.
1-4

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

1
The Genius NIU
The VersaMax Genius Network Interface Unit (IC200GBI001) interfaces a
VersaMax I/O Station to a Genius I/O bus. The system host can be any PLC or
computer capable of controlling the Genius bus.
E

GBI001
PWR
OK
FAULT
I/O ENBL
FORCE

IC200GBI001
Genius® NIU

SBA ERR
BUS B

U 0 1
A
N

2
3

SBA
X10

2
3

SBA
X1

2
3

BAUD
RATE

9 0 1
8
7

6 5 4
0 1

THIS DEVICE COMPLIES WITH PART 15 OF
THE FCC RULES. OPERATION IS SUBJECT
TO THE FOLLOWING CONDITIONS:
1) THIS DEVICE MAY NOT CAUSE
HARMFUL INTERFERENCE.
2) THIS DEVICE MUST ACCEPT ANY
INTERFERENCE RECEIVED, INCLUDING
INTERFERENCE THAT MAY CAUSE
UNDESIRED OPERATION.
THIS DIGITAL APPARATUS DOES NOT
EXCEED THE CLASS A LIMITS FOR RADIO
NOISE EMISSIONS FROM DIGITAL APPARATUS
SET OUT IN THE RADIO INTERFERENCE
REGULATIONS OF THE CANADIAN DEPARTMENT OF COMMUNICATIONS. FOR USE IN
A CONTROLLED ENVIRONMENT. REFER TO
MANUALS FOR ENVIRONMENTAL
CONDITIONS.
ENCAD D'UTILISATION EN ATMOSPHERE
CONTROLEE. CONSULTER LA NOTICE
TECHNIQUE.

SERIAL A1
SERIAL A2
SHIELD IN
SHIELD OUT

IND CONT EQ FOR HAZ LOC
CLASS I DIV 2 GROUPS ABCD
Ambient 60C
CLASS I ZONE 2 GROUP IIC
Ex nA II 0C150V

80°C

1500ft
455m

2000ft
606m

3000ft
909m

4500ft
1364m

(A)9818
(B)9855
(M)M4230

*
CM
CM

.315in
8.00mm

100 ohms

4 (two pair)
#22

150v

60°C

1200ft
364m

1700ft
516m

3000ft
909m

4500ft
1364m

(A)9110
(B)89696
(B)89855

none
CMP
CMP

.274in
6.96mm

100 ohms

4 (two pair)
#22

150v

200°C

1200ft
364m

1700ft
516m

3000ft
909m

4500ft
1364m

(A)9814C)
(B)9463
(M)M4154

none
CM
CL2

.243in
6.17mm

75 ohms

2 / #20

150v

60°C

800ft
242m

1500ft
455m

2500ft
758m

3500ft
1061m

(A)5902C
(B)9302
(M)M17002

none
CM
CM

.244in
6.20mm

75 ohms

4 (two pair)
#22

300v

80°C

200ft
60m

500ft
152m

1200ft
333m

2500ft
758m

1/2 Watt

Notes:

GFK-1535A

Maximum Length Cable Run,
feet/meters at baud rate

A = Alpha, B = Belden, C = Consolidated, E = Essex, M = Manhattan, O = Olflex
• = Limited to 16 taps at 38.4 Kbaud
* = not known
**= Suitable for applications requiring high flexibility, continuous flex or vibration.

Chapter 2 Installation

2-15

NEC classes are based on data obtained from manufacturers and are subject to
change. CANADIAN CEC codes are similar. Other countries may vary.
The serial bus can be treated as a Class 2 circuit when appropriate wiring practices
are followed. Maximum available bus lengths may be affected when installation
requires the high voltage CM (Communications) rating. CM types can replace CL2,
but not vice versa.
Do not mix cables of different impedance, regardless of cable run length. Do not
mix cable types in long and/or noisy installations. Other, small-size twisted pair
shielded wire of unspecified impedance can be used for short runs of 50 feet or less,
using 75 ohm terminations. Selection of wire type may be limited by local and
national codes and industry standards. Consult the cable manufacturer to determine
the cable's suitability for a particular type of installation.
Conservative wiring practices and national and local codes require physical
separation between control circuits and power distribution or motor power. Refer to
sections 430 and 725 of the National Electric Code.

2-16

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

2
Using Other Cable Types
The cable types listed in the preceding table are recommended. If the cable types
listed above are not available, the cable selected must meet the following guidelines.
1. High quality construction. Most important is uniformity of cross section along
the length of the cable. Poor quality cable may cause signal distortion, and
increase the possibility of damage during installation.
2. Precision-twisted shielded wire of EIA RS422 standard type, having a uniform
number of twists per unit of length. This type of cable may also be listed as
twinaxial cable, data cable, or computer cable.
3. Relatively high characteristic impedance; 100 to 150 ohms is best; 75 ohms is
the minimum recommended.
4. Low capacitance between wires, typically less than 20pF/foot (60pF/meter). This
may be accomplished by inner dielectrics of foamed type, usually polypropylene
or polyethylene, having a low dielectric constant. Alternatively, the conductors
may be spaced relatively far apart. Lower impedance types have smaller crosssections and provide easier wiring for shorter total transmission distances.
5. Shield coverage of 95% or more. Solid foil with an overlapped folded seam and
drain wire is best. Braided copper is less desirable; spiral wound foil is least
desirable.
6. An outer jacket that provides appropriate protection, such as water, oil, or
chemical resistance. While PVC materials can be used in many installations,
Teflon, polyethelene, or polypropylene are usually more durable.
7. Electrical characteristics: cable manufacturers' information about pulse rise time
and NRZ data rate is useful for comparing cable types. The Genius bit consists of
three AC pulses; the equivalent NRZ bit rate is about three times as great.
For assistance in selecting a specific cable type, please consult your local GE Fanuc
application engineer.

Bus Length
The maximum bus length for shielded, twisted-pair cable is 7500 feet. Some cable
types are restricted to shorter bus lengths. In turn, the bus length determines which
baud rate may be selected. Refer to the heading Selecting a Baud Rate.

GFK-1535A

Chapter 2 Installation

2-17

2
Making Bus Connections
The NIU has two bus connectors. The upper connector is for the main bus cable; it
is always used. The lower connector is for an optional redundant bus cable. The
NIU has built-in bus switching capability. In a dual-bus installation, do not attach a
separate bus switching device to the NIU. (The NIU can be located on a bus stub
downstream of a bus-switching device, however).
The maximum exposed length of unshielded wires should be 5cm (2in). For
protection, each shield drain wire should be insulated with spaghetti tubing to keep the
Shield In and Shield Out wires from touching each other or the signal wires.
SERIAL A1

Main Bus
Connections

SERIAL A2
SHIELD IN
SHIELD OUT

Redundant
Bus
Connections

SERIAL B1
SERIAL B2
SHIELD IN
SHIELD OUT

1.
2.

Connect Serial 1 to the Serial 1 terminals of the previous and next devices.
Connect Serial 2 to the Serial 2 terminals of the previous and next devices.

Connect Shield In to Shield Out of the preceding device. Connect Shield Out
to Shield In of the next device. If the NIU is the first device on a bus, Shield In
can be left unconnected. If it is the last device on a bus, Shield Out can be left
unconnected.

When inserting two wires into the same terminal, the wire size must be
0.86mm2 (18AWG) or smaller. Both wires should be the same size and type.
Do not mix stranded with solid wire in the same position.

Terminating a Bus
If the bus terminates at the NIU, connect a 75, 100, 120, or 150-ohm terminating
resistor across Serial 1 and Serial 2. The use of a ferrule is recommended to crimp
each resistor lead to the corresponding serial line. If ferrules are not used, twist each
resistor lead with the corresponding serial line and solder them together before
inserting the wires into the terminal.
Terminating
Resistor
Serial 1
Serial 2
Shield In
Shield Out

2-18

Start
of Bus

End
of Bus

Terminating
Resistor
Serial 1
Serial 2
Shield In
Shield Out

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

2
Lightning Transient Suppression
Running the bus cable outdoors or between buildings may subject it to lightning
transients beyond the 1,500 volt transient rating of the system. Installing cable
underground reduces the probability of a direct lightning strike. However, buried
cables can pick up hundreds of amperes of current when lightning contacts the
ground nearby.
Therefore, it is important to protect the installation by including surge protectors on
underground data lines. The cable shields should be grounded directly. Surge
suppressors and spark gaps should be used to limit the voltage that might appear on
the signal lines. It is recommended to install two (only) silicon surge suppressors or
spark gaps to control transients of 1 to 25 Kilovolts from 100 to 1000 amps or more.
These devices should be installed close to the entrance of the bus to the outdoors.
In extreme situations, such as totally-isolated power systems, additional protection
against lightning damage should be provided. Such suppressors should be installed
from incoming power leads to ground.

Adding Suppression at the Communications Line
For an individual NIU, suppression can be supplied by connecting two small metal
oxide varistors (MOVs) from Serial 1 and Serial 2 to the Shield Out terminal:
S1

MOVs

S2
SHLD IN

(bus cable not shown)

SHLD OUT

Suitable MOVs include Harris part number V220MA2A, Panasonic ERZCO5FK221U, and Siemens 505K140. If necessary, higher energy-rated devices can
also be used.
The use of a ferrule is recommended to crimp each MOV lead to the corresponding
serial line. If ferrules are not used, twist each MOV lead with the corresponding
serial line and solder them together before inserting the wires into the terminal
block.
It is important to be sure that the MOV leads do not cause any shorts between the
serial data and shield connectors.

GFK-1535A

Chapter 2 Installation

2-19

2
Observing the LEDs
The LEDs indicate the presence of power and show the operating mode and status
of the NIU.
PWR
OK
FAULT
I/O ENBL
FORCE

PWR

Indicates that the NIU is receiving power.

Indicates diagnostics executed successfully.

FAULT

Is ON if there are one of more faults.

I/O ENBL

This bicolor LED is green if the I/O scan is
enabled and data is being received from the
bus. Otherwise, this LED is amber.

FORCE

Is ON if one of more I/O points is forced* or
bus switching is forced.

SBA ERR

Is ON if a duplicate device SBA or no valid
SBA is selected.

BUS B

Is ON if bus B is active.

SBA ERR
BUS B

* Forcing inputs and outputs from the programmer does not force the actual input
and output points on the NIU. Forcing actual I/O points requires the use of
datagrams from the PLC to the NIU.

2-20

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

2
CE Mark Installation Requirements
The following requirements for surge, electrostatic discharge (ESD), and fast
transient burst (FTB) protection must be met for applications that require CE Mark
listing:

GFK-1535A

The VersaMax I/O Station is considered to be open equipment and should
therefore be installed in an enclosure (IP54).

This equipment is intended for use in typical industrial environments that
utilize anti-static materials such as concrete or wood flooring. If the equipment
is used in an environment that contains static material, such as carpets,
personnel should discharge themselves by touching a safely grounded surface
before accessing the equipment.

If the AC mains are used to provide power for I/O, these lines should be
suppressed prior to distribution to the I/O so that immunity levels for the I/O
are not exceeded. Suppression for the AC I/O power can be made using
line-rated MOVs that are connected line-to-line, as well as line-to-ground. A
good high-frequency ground connection must be made to the line-to-ground
MOVs.

AC or DC power sources less than 50V are assumed to be derived locally from
the AC mains. The length of the wires between these power sources and the
PLC should be less than a maximum of approximately 10 meters.

Installation must be indoors with primary facility surge protection on the
incoming AC power lines.

In the presence of noise, serial communications could be interrupted.

Chapter 2 Installation

2-21

Chapter

Operation

3
This section explains how the NIU interacts with the modules in its station, how it
stores data, and how it exchanges data on the bus.

NIU data memories
Scanning inputs and outputs in the I/O Station
Data transfer between the Genius NIU and the bus
Genius bus scan time

Genius Hand-held Monitor Use
The Network Interface Unit does not have a Hand-held Monitor connection. A
Genius Hand-held Monitor cannot be used to configure, monitor I/O, or force and
unforce I/O.
If there is a Hand-held Monitor elsewhere on the bus, it will display the presence of
the NIU on the bus as an “unsupported device”.

GFK-1535A

3-1

3
NIU Data Memories
All of the data for the I/O station utilizes the NIU's four I/O data memories.
The NIU has 128 bytes of memory available for each of the four types of data
(discrete inputs and outputs, data types I and Q, and analog inputs and outputs, data
types AI and AQ). During NIU configuration, data for individual modules is
assigned to specific areas of this memory.
NIU Memory
Type

Typically Used For

Amount
Available in NIU

discrete inputs, and status data from intelligent modules
(each byte contains 8 input points)

128 bytes

discrete outputs, and fault clearing for intelligent modules
(each byte contains 8 output points)

128 bytes

analog inputs (requires 2 bytes per channel)

128 bytes

analog outputs (requires 2 bytes per channel)

128 bytes

Data always starts at the beginning of each table.
Each table starts at 1 internally. The combination of analog channels and discrete
points must not exceed 128 bytes for inputs and 128 bytes for outputs.

3-2

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

3
Scanning Inputs and Outputs in the I/O Station
The NIU performs a regular I/O scan of all inputs and outputs.
During each I/O scan, the NIU reads inputs from all discrete and analog input
modules and places the data into its I and AI memories.
The NIU also sends outputs from its Q and AQ memories to all discrete and analog
output modules.

Discrete Input
Modules

NIU Memories
I
AI
Q
AQ

Analog Input
Modules
Discrete Output
Modules
Analog Output
Modules

Data Handling for Modules with More than One Data Type
Some modules have multiple types of I/O data. The NIU reads all input data from
these modules and sends all their output data during every I/O scan.

NIU Memories
I
Q
AI
AQ

GFK-1535A

Chapter 3 Operation

Module

3-3

3
Data Transfer Between the NIU and the Bus
Each bus scan, an NIU exchanges the following data with the bus:
It sends an input message with up to 128 bytes of discrete and/or analog inputs.
It receives an output message with up to 128 bytes of discrete and/or analog
outputs.
The exact length of these messages is determined by the network I/O map
configured for the NIU.

Communications on the Genius Bus
After the NIU completes a successful login on the bus, it starts sending input data
and accepting output data on the bus. The NIU communicates on the bus
repetitively and asynchronously relative to the I/O scan. When the NIU receives the
bus communications token, it sends the most recent data from its I and AI
memories.

NIU Memories
BUS

I
AI
Q
AQ

The NIU receives new outputs from the bus when the PLC or computer bus
controller has the communications token. The NIU places these outputs its Q and
AQ output tables.
NIU Memories
BUS

I
AI
Q
AQ

These outputs are then passed to the devices in the station on the NIU's next internal
I/O scan.

3-4

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

3
Input Data Format
When the NIU takes its turn on the bus, it sends one input data message containing
the latest values for all configured discrete inputs followed by all configured analog
inputs. Because they are broadcast, they can be obtained by any bus controller on
the bus.
Input Data Message
(up to 128 bytes)

⇐
To CPU

discrete inputs

Í Configured I Length Î
I starting reference data

analog inputs

Í Configured AI Length Î
AI starting reference data

The data lengths are equal to the lengths of I and AI data configured in the NIU.
Either length may be zero.
Discrete inputs appear in the input message in the same sequence as their assigned
input references. Each discrete input module occupies one byte per eight circuits.
Analog inputs are also in the same sequence as their input references. Each analog
input module occupies two bytes (one word) for each analog channel.

Input Defaults
If an input module is removed or fails to operate correctly, its configured default
state is substituted for actual input data. A diagnostic message is provided to
indicate loss of module. Forced input data is not affected.

I/O Data Handling by the PLC or Computer
How a PLC or computer handles input data from the NIU depends on its type:
A VersaMax or Series 90 PLC places the data in the %I and %AI references
selected during PLC configuration. These must be the same references selected
during NIU configuration.

GFK-1535A

A Series Six or Series Five PLC places the data into I/O table or register
memory. A beginning address in Series Six or Series Five I/O Table memory
can be entered during station configuration.
A host computer with a PCIM places the data into the input table segment that
corresponds to the serial bus address (Device Number) of the NIU.

Chapter 3 Operation

3-5

3
Output Data Format
Each time the PLC or computer that controls the NIU has the bus communications
token, it sends fresh output data on the bus. Outputs for the NIU are sent in one
output data message, with all configured discrete outputs followed by all configured
analog outputs.

⇐
To
Station

Output Data Message
(up to 128 bytes)
discrete outputs

Í Configured Q Length Î
Q starting reference data

analog outputs

Í Configured AQ Length
AQ starting reference data

The data lengths are equal to the configured lengths of Q and AQ data selected for
the NIU (regardless of the host type or the amount of output data needed for the
modules physically present in the station). Either length may be zero.
When generating the output data message, a Series 90 bus controller automatically
places the Q data ahead of the AQ data. Other types of controllers must send an
output message consisting of the correct number of bytes of discrete output data
followed by the correct number of bytes of analog output data. The output data
format shown above is required by the NIU.
As soon as new output data is received, the NIU checks to be sure the data is errorfree and of the correct length. After verifying the accuracy of the data, the NIU puts
the data in its Q and AQ tables. Each discrete output module receives one byte of
data for every eight points. Each analog output module receives two bytes (one
word) for each analog channel.

Output Defaults
Except for outputs that have been previously forced, all other outputs are set to their
programmed defaults during the first Genius bus scan after powerup. The
previously-forced outputs are immediately set to their forced values.
If the NIU loses contact with its host for three successive bus scans or 1.2 seconds,
whichever occurs first, the NIU takes control of the outputs. The NIU sets output
data to the configured values. If the NIU loses contact with its host for 3 bus scans
or 1.2 seconds, and it has been configured in “Hot Standby” or “Duplex”
Redundancy mode, or if configured as a “BSM Controller”, or as “BSM present”,
the NIU operates as described in the Genius I/O System and Communications
Manual.

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3
Genius Bus Scan Time
The Genius bus scan time is dependent on the number of devices and amount of
data traffic on the bus. The bus scan time may vary from 3-400ms, but 20-30ms is
typical. It cannot be less than 3ms.
The Genius bus scan time contribution for the NIU depends on its I/O data usage.
The table below shows the scan time contribution, at each baud rate, for stations
with a total of 16, 32, 64, 128, and 256 bytes, when the NIU receives outputs from
only one bus controller at a time.
To find the exact scan time contribution for the NIU, follow the procedure below.
Total Amount of Input
and Output Data
16 bytes
32 bytes
64 bytes
128 bytes
256 bytes (fully-loaded)

Contribution time in ms at each baud rate
153.6 Kb std 153.6 Kb ext
76.8 Kb
38.4 Kb
2.09
3.24
5.52
10.10
19.25

2.16
3.31
5.60
10.17
19.32

3.83
6.12
10.69
19.85
38.15

7.16
11.74
20.89
39.20
75.80

Procedure for Estimating Bus Scan Time
1.

Find the total number of input bytes and output bytes. (Each analog
channels is 2 bytes. Each eight discrete points are one byte).
number of input bytes
=
________
number of output bytes =
________
total bytes
=
________
With this total, calculate a scan time contribution using the formula below
that corresponds to the Genius bus baud rate.
Formula for 153.6 Kbaud Standard:
0.943ms + (0.0715 x total bytes)

= ________ ms

Formula for 153.6 Kbaud Extended:
1.015ms + (0.0715 x total bytes)

= ________ ms

Formula for 76.8 Kbaud:
1.538ms + (0.143 x total bytes)

= ________ ms

Formula for 38.4 Kbaud:
2.583ms + (0.286 x total bytes)

GFK-1535A

Chapter 3 Operation

= ________ ms

3-7

3
Timing Responsiveness
If an output in the station is tied to an input in the same station, the output changes
state (or value, in the case of an analog output module) within a few milliseconds of
the new output being sent from the bus controller to the NIU. (To guarantee that an
output changes state, that state must be present for at least one NIU sweep time or
one Genius bus scan time, whichever is greater.
The input which is tied to the output responds as soon as any load-effects have
settled out and input filtering is completed. This may occur as soon as the NIU’s
next I/O scan.
If the host is a PLC, an input must be present for at least one PLC sweep time plus
one Genius bus scan time plus one NIU sweep time to guarantee its detection by the
PLC. If the input changes state only briefly, and then changes again before the
input data is sent on the bus, the interim state may be overwritten in the NIU’s
internal memory by some new input state or value before it can be sent.

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Configuring a Genius NIU and I/O Station

Chapter

4
This chapter explains how a Genius NIU and the modules in an I/O Station can be
configured. Configuration determines certain characteristics of module operation
and also establishes the program references that will used by each module in the
system.
This chapter describes:

Using autoconfiguration or programmer configuration
The Genius NIU and I/O Station can be either autoconfigured or configured
from a programmer using the Remote I/O Manager configuration software.

Configuring racks and slots
Even though a VersaMax I/O Station does not have a module rack, both
autoconfiguration and software configuration use the traditional convention of
“racks” and “slots” to identify module locations.

Software configuration of the Genius NIU and I/O Station
Software configuration provides greater flexibility than autoconfiguration in
setting up an I/O Station. Software configuration is done using the Remote I/O
Manager configuration software.

Autoconfiguration of the Genius NIU and I/O Station
Autoconfiguration provides a default configuration for the NIU and I/O
Station and does not require the use of a programmer. I/O modules that have
software-configurable features always use their default settings when
autoconfigured.

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4-1

4
Using Autoconfiguration or Programmer Configuration
The Genius NIU and I/O Station can be either autoconfigured, or configured from a
programmer using the Remote I/O Manager configuration software. The choice of
which configuration method to use depends on the nature of the system.

Autoconfiguration
Autoconfiguration is done by the NIU itself. It provides a default configuration for
the NIU and I/O Station and does not require the use of a programmer. If there is
not a stored configuration already present at powerup, the NIU sees which modules
are installed and automatically creates a configuration for the I/O Station. I/O
modules that have software-configurable features can only use their default settings
when the I/O Station is autoconfigured. Autoconfiguration is described later in this
chapter.

Software Configuration
Using the configuration software makes it possible to reassign I/O table addresses,
and to configure many I/O module features. The configuration software runs on a
computer that connects to the NIU via the NIU expansion port.
The configuration software can be used to:

Create a customized configuration

Store (write) a configuration to the NIU

Load (read) an existing configuration from an NIU

Compare the configuration in an NIU with a configuration file stored in the
programmer

Clear an auto-configuration that was previously stored to the NIU
(“autoconfigure”)

The NIU retains a software configuration across power cycles. Storing a
configuration disables autoconfiguration, so the PLC will not overwrite the
configuration during subsequent startups.
However, actually clearing a configuration from the programmer does cause a new
autoconfiguration to be generated. In that case, autoconfiguration is enabled until a
configuration is stored from the programmer again.
Software configuration is summarized later in this chapter. Instructions for
installing and using the configuration software are in the Remote I/O Manager
Software User’s Guide (GFK-1847).

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4
Configuring “Racks” and “Slots”
Even though a VersaMax I/O Station does not have a module rack, both
autoconfiguration and software configuration use the traditional convention of
“racks” and “slots” to identify module locations. Each logical rack consists of the
NIU or an Expansion Receiver module plus up to 8 additional I/O and option
modules mounted on the same DIN rail. Each I/O or option module occupies a
“slot”. The module next to the NIU or Expansion Receiver module is in slot 1.
Booster power supplies do not count as occupying slots.
Booster Power
Supply

Main Rack (rack 0)

NIU

The main rack is rack 0. Additional racks are numbered 1 to 7.

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4
In an I/O Station that has one expansion rack attached to the expansion bus by a
non-isolated Expansion Receiver Module (IC200ERM002), the expansion rack
must be configured as rack 1.
VersaMax I/O Station Main Rack
PS

NIU

VersaMax Expansion Rack
PS

ERM

In an I/O Station with an Expansion Transmitter Module (IC200BTM001) and up to
seven expansion “racks”, each with an Expansion Receiver Module (IC200ERM001
or IC200ERM002), the additional racks are configured as rack 1 through rack 7.
VersaMax I/O Station Main Rack (0)
ETM

NIU
VersaMax ExpansionRack 1
PS
15M with any
IC200ERM002 ERMs
750M with all
IC200ERM001 ERMs

ERM
VersaMax ExpansionRack 7
PS

Terminator
Plug
ERM

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4
Software Configuration of the Genius NIU and I/O Station
Software configuration provides greater flexibility than autoconfiguration in setting
up an I/O Station. Software configuration is done using the Remote I/O Manager
configuration software. The software is available with a programmer cable as
catalog number IC641CFG110, or without a programmer cable as catalog number
IC641CFG100. It can also be done using the VersaPro programming/configuration
software, version 1.5 or later.
The Remote I/O Manager software can be used to configure I/O Stations with
different types of NIUs (for example: an Ethernet, Genius, or Profibus NIU). It can
also be used for CPU configuration. Details of installing and working with the
configuration software are given in the Remote I/O Manager Software User’s Guide
(GFK-1847).
The Remote I/O Manager software runs on a computer equipped with Windows
95/98, NT 4.0, or Windows 2000. Note that VersaPro 1.1 and the NIU
Configuration software cannot be installed on the same machine. If VersaPro 1.1 is
present, you will be prompted to un-install it.

Notes on Using the Configuration Software

GFK-1535A

The same Remote I/O Manager software can configure different types of
VersaMax NIUs and all supported IO modules.

Empty slots are allowed in an NIU configuration (unlike an autoconfiguration).

The I/O Station cannot include the following communication modules:
IC200BEM002 and IC200BEM103.

The reference addresses assigned to modules in the I/O Station can be edited.
Addresses do not need to be consecutive.

Chapter 4 Configuring a Genius NIU and I/O Station

4-5

4
Basic Steps of Software Configuration
The Remote I/O Manager software provides a simple default configuration that you
edit to match the actual system modules. The default configuration consists of a
power supply (PWR001) and an NIU (either a Genius NIU or the NIU that was
saved last time the software was used). Carriers and modules are then added in the
same sequence as the hardware installation.
The basic configuration steps are listed below.

Configure the rack type (non-expanded, single-ended expanded, or multi-rack
expanded). This automatically adds the appropriate types of expansion modules
to the racks.

Configure the power supply type and any booster power supplies and carriers.

Configure the NIU. This includes changing the NIU type if necessary, and
assigning its parameters as described on the next page.

Configure the expansion modules if the system has expansion racks.

Add module carriers and define wiring assignments.

Place modules on carriers and select their parameters. Configurable parameters
of I/O modules are described in the VersaMax Modules, Power Supplies, and
Carriers User’s Manual (GFK-1504).

Save the configuration file so that it can be stored to the NIU.

For step-by-step instructions, please refer to the Remote I/O Manager Software
User’s Guide (GFK-1847).

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4
Configuring NIU Parameters
NIU configuration establishes the basic operating characteristics of the Network
Interface Unit.
When a programmer is first connected, the NIU communicates using the default
communications parameters: 19,200 baud, odd parity, one start bit, one stop bit, and
eight data bits. If these parameters are re-configured, the new configuration for the
serial port is not actually installed until the programmer is removed. Once these new
settings take effect, they will be used at powerup instead.
Feature

Description

Default

Choices

Data Rate (bps)

Data transmission rate (in bits per second).

19200

4800, 9600, 19200

Parity
Stop Bits

Determines whether parity is added to words
Number of stop bits used in transmission. (Most
serial devices use one stop bit; slower devices
use two.)
In an expansion system with one or more
Isolated Expansion Receiver Modules
(IC200ERM001), the default bus speed is
250kHz (“Extended Distance”). If the bus is less
than 250 meters, this parameter can be
changed to “Normal” (1MHz). If no Isolated
Receiver Module is present, the bus speed
defaults to Normal (3Mhz).

Odd
1

Odd, Even, None
1, 2

Extended
Distance

Extended, Normal

Expansion Bus
Speed

Configuring I/O References
As I/O modules are added to the configuration, the configuration software keeps a
running total of input/output memory. If the modules added consume more than the
maximum memory available, the configuration software displays the reference
address of the module that caused the error, and an error message.
The I/O Station, including all expansion racks, can include up to 128 bytes of inputs
and 128 bytes of outputs.
You can change the I/O references assigned to a module when configuring that
module.

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4
Software Configuration: Load, Store, Verify, Clear
To transfer and check the contents of a configuration, use the Load/Store/Verify
functions from the Tools menu. A configuration file must be saved in the
programmer before using the load/store/verify functions.
The computer connects to the expansion port. on the side of the Genius NIU or the
pass-through serial port on an Expansion Transmitter Module.
Programmer

6 ft
VersaMax I/O Station, No Expansion
PS
Firmware Update
Serial Cable
IC200CBL002
NIU

VersaMax I/O Station with
Expansion Transmitter

ETM

Programmer

NIU

Expansion
Cable

Terminator Plug
ERM

The programmer must be communicating with the NIU. The configuration software
has a set of communications parameters that need to be correctly set for
communicating with the Genius NIU. To check these parameters, in the Tools
menu, select Communications Setup.
If the communications parameters shown are not correct, you can change them.
Choose DEFAULT on the Devices tab to select COM1 as the serial port and
as the SNP ID. You can make additional changes by selecting Edit or by
going to the Ports tab.

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4
Storing a Configuration to the Genius NIU
After completing a configuration in the programmer, the configuration must be
stored to the Genius NIU. In the Tools menu, select Load/Store/Verify and click on
Store. When a configuration is stored, the NIU automatically drops off the bus until
the store is complete. The NIU then comes back on the bus.
Storing a configuration disables autoconfiguration, so the NIU will not overwrite a
software configuration with an autoconfiguration during subsequent startups. If a
store operation is aborted, autoconfiguration may occur. The NIU also
autoconfigures if the programmer cable is disconnected or power is cycled on the
NIU before the store completes.
If there are any mismatched, missing, or extra modules, the store operation
continues. Modules that are mismatched or extra in the stored configuration will not
be scanned. The NIU will generate faults for these conditions.

Loading a Configuration from the NIU to the Programmer
The programming software can load a previously-stored configuration from the
Genius NIU back to the programmer. In the Tools menu, select Load/Store/Verify
and click on Load.
Note that the following modules share hardware module IDs:
IC200MDL650 loads as IC200MDL636
IC200MDL750 loads as IC200MDL742
IC200MDL331 loads as IC200MDL329
IC200MDD844 loads as IC200MDD842
IC200MDL141 loads as IC200MDL140
If an autoconfiguration containing these modules is loaded, an incorrect catalog
number and description may be displayed by the software. Edit any incorrect
modules using the programmer before storing the configuration back to the NIU.
Once this has been done, you will be able to load the configuration properly.

Comparing Configurations in the Programmer and NIU
Use the verify function to compare a configuration file in the programmer with a
configuration that was previously-stored to the Genius NIU In the Tools menu,
select Load/Store/Verify and click on Verify.

Deleting a Software Configuration from the NIU
Use the clear function to remove a previously-stored configuration from the NIU.
Clearing a configuration causes a new autoconfiguration to be generated.
Autoconfiguration remains enabled until a configuration is stored from the
programmer again.

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4
Autoconfiguration of the Genius NIU and I/O Station
Autoconfiguration is done by the NIU itself. It provides a default configuration for
the NIU and I/O Station and does not require the use of a programmer. I/O modules
that have software-configurable features always use their default settings when
autoconfigured.
When autoconfiguration is enabled and no previous autoconfiguration exists, at
powerup the NIU automatically reads the default configuration of the modules
installed in the system.
Once this autoconfiguration is complete as described below, the NIU retains this
configuration until it is either cleared or powered up with I/O modules added to the
existing configuration.

Autoconfiguration Sequence
Each module is considered to occupy a “slot”. The position adjacent to the NIU is
slot #1. Booster power supplies do not count as occupying slots.
Booster Power
Supply

NIU

Autoconfiguration starts at slot 1 of rack 0 (the main rack) and continues in the
same order the modules occupy in the I/O Station.
Autoconfiguration stops at the first empty slot or faulted module. For example, if
there are modules in slots 1, 2, 3, 5 and 6 but slot 4 is empty, the modules in slots 5
and 6 are not autoconfigured. The NIU reports Extra I/O Module faults.
For the autoconfiguration process to work as expected, any additional power
supplies in the I/O Station must be powered up at exactly the same time or before
the main power supply.

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GFK-1535A

4
Autoconfiguration Assigns Reference Addresses
The NIU stores data internally as discrete input bits, discrete output bits, analog
input words, and analog output words.
The NIU Data Memories
I discrete input bits
AI analog input words
Q discrete output bits
AQ analog output words

During autoconfiguration, the NIU automatically looks at the modules installed in
the I/O Station and assigns them to addresses in this internal I/O map. Reference
addresses are assigned in ascending order. For modules that have multiple data
types (for example, mixed I/O modules), each data type is assigned reference
addresses individually.
Modules that have software-configurable features use their default settings when
autoconfigured. These features are described in the VersaMax Modules, Power
Supplies, and Carriers Manual (GFK-1504).

Adding I/O modules to an Autoconfigured I/O Station
If additional I/O modules are added to an existing I/O Station, they do not become
part of the autoconfiguration until the NIU is power-cycled.

Clearing an Autoconfiguration
To clear an existing autoconfiguration, power down the NIU, disconnect the NIU
from the first I/O module, disconnect the expansion rack cable if present, and power
up the NIU. The configuration in the NIU is then cleared. (An existing software
configuration is cleared from the programmer, as described previously in this
chapter.)

Hot Inserting I/O Modules
It is possible to hot insert I/O modules in an I/O Station. If the module being
replaced already exists in the configuration, no other action is necessary to make the
module operable.

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4-11

4
Autoconfiguring an I/O Station with Expansion Racks

4-12

The Expansion Receiver modules must have their rack ID selection dials set
correctly. Any available rack number can be used for a new expansion rack but
they must all be unique (no duplicate rack numbers). It is best to assign
expansion racks numbers from lowest (1) to highest (7) as they are installed.

If a new expansion rack is added in the future, it should be assigned a rack
number that is higher than the racks that are already installed. If a new
expansion rack with a lower rack number is added and the system is then autoconfigured, the racks numbered higher than the new rack number have their I/O
reference addresses shifted in the reference tables. Any existing program logic
using those references would need to be adjusted to use the new references.

When autoconfiguring an I/O Station with expansion racks, either all racks
must be powered from the same source or the expansion racks must be powered
up before the main rack.

To add another expansion rack to the I/O Station, the I/O Station must be
powered down. After adding the expansion rack, power up the I/O Station. It
will then autoconfigure.

To force autoconfiguration for expansion racks, first power down the NIU.
Remove the transmitter module from the NIU or remove the expansion cable at
the transmitter. Power up the NIU and let it autoconfigure. Power the NIU
down again, reattach the transmitter or cable and power up the NIU again.

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4
How Autoconfiguration Handles Equipment Changes
Previously-configured modules are not removed from the configuration during
autoconfiguration unless no modules are present in the system during the
autoconfiguration.
Module Present But Non-Working During Autoconfiguration: if a module is
physically present but not working during autoconfiguration, the module is not
configured and the NIU generates an extra module diagnostic.
Empty Slot During Autoconfiguration: Autoconfiguration stops at the first empty slot.
Modules located after the empty slot are not autoconfigured. The NIU generates an
extra module diagnostic for each of them.
If a module that was not previously-configured or present at powerup is installedafter powerup, the NIU generates an extra module diagnostic and the module is not
added to the system configuration.
Previously-Configured Modules Not Present During Autoconfiguration: Previouslyconfigured modules are not removed from the configuration during
autoconfiguration unless no modules are present in the system. For example, if
modules are configured in slots 1, 2, and 3 then power is removed and the module in
slot 1 is removed, when power is reapplied the modules in slots 2 and 3 operate
normally. The original module in slot 1 is not removed from the configuration. The
NIU generates a loss of module diagnostic for slot 1.
Different Module Present During Autoconfiguration: If a slot was previouslyconfigured for one module type but has a different module installed during
autoconfiguration, the NIU generates a configuration mismatch diagnostic. The slot
remains configured for the original module type.
Unconfigured Module Installed After Autoconfiguration: If a module that was not
previously-configured is installed-after powerup, the NIU generates an extra
module diagnostic and the module is not added to the configuration.
Previously-configured Module Installed After Autoconfiguration : If a module that was
previously-configured but missing at powerup is installed after powerup, the NIU
generates an addition of module diagnostic and the module is added back into the
I/O scan.
All Modules Removed After Autoconfiguration: If all modules are absent at powerup,
the NIU clears the configuration. This allows modules to be inserted and added to
the configuration at the next powerup.

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Chapter

Datagrams

5
This section lists datagrams that can be sent to or from a Genius Network Interface
Unit, and shows the datagrams for VersaMax modules that are different from the
formats used by other modules.
It also shows the format of configuration data for the Network Interface Unit and
the modules in the station.

Read Map
Read Map Reply
Report Fault Datagram Format
Configuration Data
Set Network Interface Unit Operating Mode

Unless otherwise noted, all multi-byte fields are stored with the least significant
byte in the lowest memory location followed by the most significant byte. For
double word data, the least significant word is stored in the lowest memory location.

For Additional Information, Also See:
The User's Manual for the PLC or computer, which should explain the specific
programming used to send datagrams.
The Genius I/O System and Communications Manual, which describes Genius
datagrams and data formats.

GFK-1535A

5-1

5
Datagram Types
The table below shows the primary datagrams that may be acted upon by the NIU.
Datagram Type
Read Identification

5-2

Subfunction Code
(hexadecimal)
00

Network Interface Unit
Action
send Read ID Reply

Read Configuration

send Read Configuration Reply

Write Configuration

process (possibly send configuration changes)

Assign Monitor

process

Begin Packet Sequence

start sequence

End Packet Sequence

end/check sequence

Read Diagnostics

send Read Diagnostics Reply

Clear All Faults

process

Set Baud Rate

process (send Set Baud Rate Reply)

Set Serial Bus Address
(SBA)

process

Set Status Table Address

process

Force I/O

process

Unforce I/O

process

Force BSM

process (send config. change)

Unforce BSM

process (send config. Change when last point is unforced)

Switch BSM

process

Configuration Protect

process

Configuration Unprotect

process

Read Map

send Read Map Reply

Set Operating Mode

process

Read I/O Forces(future)

send Read I/O Forces Reply (future)

Read Slot Diagnostics
(future)

send Read Slot Diagnostics Reply (future)

Read Operating Mode

send Read Operating Mode Reply

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5
Read Map
Subfunction Code: 2A hex
This datagram is used to read the reference addresses and lengths that have been
configured for the NIU's network I/O map.
Data Field Format: none

Read Map Reply
Subfunction Code: 2B hex
An NIU sends this reply datagram after receiving a Read Map datagram. It contains
the previously-configured NIU network map addresses. The network map defines
the NIU memory locations of the data that is exchanged on the bus. It provides no
information about the I/O assignments of individual I/O modules in the station.
However, the checksums indicate whether the overall configuration has been
changed.
Byte No.

0
1
2
3

Byte Description

Not used
Starting reference for discrete input ( I ) data (LSB)
Starting reference for discrete input ( I ) data (MSB)
Length of discrete input ( I ) data (in bytes)

4, 5
6
7, 8
9
10,11

Starting reference of analog input ( AI ) data
Length of analog input ( AI ) data (in bytes)
Starting reference of discrete output ( Q ) data
Length of discrete output ( Q ) data (in bytes)
Starting reference of analog output ( AQ ) data

12
13

Length of analog output ( AQ ) data (in bytes)
8-bit Additive Checksum Unused (always 0)

14, 15
16
17, 18

16-bit CRC Critical Checksum (lsb in 14, msb in 15) READ ONLY
8-bit Additive Checksum. Unused (always 0)
16-bit CRC Non-Critical Checksum (lsb in 17, msb in 18) READ ONLY

Starting references in I, AI, Q, and AQ memory are returned. For each memory
type, a data length is also supplied. If a length is zero, the associated starting
reference can be ignored; it is not meaningful.

GFK-1535A

Chapter 5 Datagrams

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5
Report Fault Datagram Format
The format of Report Fault datagrams sent by an NIU is shown below. A Series 90
PLC interprets this information automatically; no datagram programming is
required. If the host is a Series Six or Series Five PLC, this information is ignored.
If the host is a computer, this information can be retrieved from the unsolicited
datagram queue, and interpreted as needed for the application.
Note: The NIU can store up to 32 untransmitted fault messages. If an event occurs
that causes more than 32 faults when the NIU is unable to transmit fault messages
over the network, some messages will be lost. When communications are restored,
it is possible that the order in which the remaining messages are sent will differ
from the order in which the faults occurred.
Subfunction Code: 0F hex
Byte #

Description

0
1

Fault Byte 1
Fault Byte 2

2
3

Fault byte 3
Fault byte 4

Fault byte 5

5
6

Fault byte 6
Fault byte 7

Fault Byte 1
byte 0
7 6 5 4

3 2

1 0
Fault type, always: 0 0 1 1
Type of module reporting fault:
00 = discrete output
01 = discrete input
10 = analog output
11 = analog input
Suppress alarm (short fault only)
Always 0

Fault Byte 2
byte 1
7 6

5 4

3 2

1 0
Diagnostic table byte number (0 - 63) NOT USED

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5
Fault Byte 3
byte 2
7 6

5 4

3 2

1 0
Fault record number (always 1)
Number of fault records (always 1)

Fault Bytes 4 and 5
Fault bytes 4 and 5 (bytes 3 and 4 of the datagram) identify the reference offset
(within the NIU itself) assigned to the faulted module. This is an internal reference.
byte 3
7 6

5 4

3 2

1 0
Diagnostic reference address, LSB
(always 1)

byte 4
7 6

5 4

3 2

1 0
Diagnostic reference address, MSB
(always 0)

Fault Bytes 6 and 7
Fault bytes 6 and 7 (datagram bytes 5 and 6) are interpreted by a Series 90-70 PLC
automatically. They are not relevant to other types of host.
byte 5
7 6

5 4

3 2

1 0
If bit 7 = 1 Number of fault entries to set
If bit 7 = 0 Number of the discrete point or analog channel
within the module that has a fault

Fault entire I/O module
byte 6
7 6

5 4

3 2

1 0
Entity offset into diagnostic table
Reserved

GFK-1535A

Chapter 5 Datagrams

5-5

5
Configuration Data
Datagrams can be used to read and write configuration data for an I/O Station.
However, most systems will instead use the Remote I/O Manager or VersaPro
software for configuration.
For a Network Interface Unit, the configuration data specifies the “rack” and slot
number of a specific device in the station. The length specified must exactly match
the length of the configuration data for the module (Network Interface Unit or other
module in the I/O station); partial configuration data cannot be read or written. For
programming instructions, you should refer to the documentation set for the PLC.
Configuration files for conventional I/O modules can be read or written one module
per message. However, the configuration files of intelligent modules may exceed
the 128-byte maximum length of a Genius message. Therefore, any Write
Configuration to an intelligent module must be contained within a Begin/End
Packet Sequence.

Read Configuration Data
Subfunction Code: 02 hex
The Read Configuration Datagram is used to read configuration data from the NIU.

Read Configuration Data Format
Byte #
0
1, 2
3

4, 5

5-6

Description
Rack Number (0,…, 7)
Length (must match the length for the specific device whose configuration will be
written. Maximum=128)
Slot (0,…, 9.
Note that in datagrams, the slot numbering is different that the
number described elsewhere in the manual. In datagrams only: Power Supplies and
Carriers are “slot” 0
Network Interface Unit or
Expansion Receiver Module is “slot” 1)
Modules are “slots” 2-9
Offset into slot configuration data, used to read module configuration data that is
greater than 64 words in length

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
Read Configuration Reply Data
Subfunction Code: 03 hex
This datagram is a reply to the Read Configuration datagram. Bytes 0-5 are like the
Read Configuration datagram above. Bytes 6-133 contain the module data, and are
like the Write Configuration datagram..

Read Configuration Data Format
Byte #
0
1, 2
3

4, 5
6 - 31
32 to end

Description
Rack Number (0,…, 7)
Length (must match the length for the specific device whose configuration will be
written. Maximum=128)
Slot (0,…, 9.
Note that in datagrams, the slot numbering is different that the
number described elsewhere in the manual. In datagrams only: Power Supplies and
Carriers are “slot” 0
Network Interface Unit or
Expansion Receiver Module is “slot” 1)
Modules are “slots” 2-9
Offset into slot configuration data
“Rack/slot” record for the slot
Context dependent data (optional)

Multiple byte fields in datagrams are transmitted in little-endian format. In this
format, the least significant byte of a word is stored in the lowest memory location
or transmitted first in time. The most significant byte follows.

GFK-1535A

Chapter 5 Datagrams

5-7

5
Write Configuration Data
Subfunction Code: 04 hex
The Write Configuration datagram is used to send configuration data for the NIU or
a module in the I/O Station. The context-dependent slot configuration data is the
same as the Read Configuration Reply.
For each “rack” in the I/O Station, slot 0 configuration data includes the power
supply, I/O carriers, and any booster power supplies present. Because configuration
datagrams consider power supplies and carriers to be “slot 0”, this numbering
scheme is different that the actual slot numbering described elsewhere in the
manual. In rack 0, slot 1 configuration is the NIU. In expansion racks 1-7, slot 1 is
used for the Expansion Receiver Module. Up to eight I/O modules per “rack” can be
configured as slots 2 through 9.
Do not send partial configuration data; it will be rejected by the NIU. If the data is
more than 128 bytes in length, multiple packets may be used. Use the Begin and
End Packet sequence messages to ensure that a sequence of Write Configuration
messages is treated as a single entity. Each packet should be in slot order. Multiple
packets for a slot must also be in order. Multiple packets must be 128 bytes in
length except the last which may be shorter.
Note: Multiple byte fields in datagrams are transmitted with the least significant
byte of a word in the lowest memory location or transmitted first in time. The most
significant byte follows.

Example:
Begin Packet Sequence
Write Configuration 1

(subfunction code 06 hex)
(subfunction code 04 hex)

Write Configuration 2
Write Configuration N
End Packet Sequence

(subfunction code 07 hex). The total number of BYTES in all Write
Configuration packets. The End Packet Sequence has 2 bytes. Byte 0 is
the least significant byte of the data length; byte 1 is the most significant.

Write Configuration Data Format
Byte #
0
1
2
3
4, 5
6 - 31
32 to end
5-8

Description
Rack Number (0,…, 7)
Length of this message (must match the length for the specific device whose
configuration will be written.)
Slot (0,…, 9. Network Interface Unit is 1)
Packet number (0, 1, 2, …)
Slot length (bytes)
“Rack/slot” record for the slot
Context dependent data (optional)

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
Power Supply and Carriers Configuration Data Format (Rack 0-7, slot 0)
(Byte in
Message)
6, 7
8
9

GFK-1535A

(Byte in
Record)
0, 1
2
3

10,…, 13

4,…, 7

14
15
16, 17
18
19
20, 21

8
9
10, 11
12
13
14, 15

22,…, 29
30, 31
32, 33
34
35
36,…, 39
40

16,…, 23
24, 25
0, 1
2
3
4,…, 7
8

41
42
43
44
45
46
47
48,…, 55
56, 57

9
10
11
12
13
14
15
16,.., 23
24, 25

Chapter 5 Datagrams

Byte Description
not used (00,00)
major type (01)
power supply type:

0 = none

5 = IC200PWR001
10 = IC200PWR002
15 = IC200PWR101
20 = IC200PWR1021
40 = IC200PWB001 (carrier)
ASCII string Set to zeros during auto-configuration, the programmer may
fill this field with an arbitrary identification string.
2
Additive checksum for entire station configuration
CRC checksum for entire station configuration
number of racks present (1)
number of slots (maximum 10)
Feature list (00 00). A bitmapped word reserved for forward compatibility
with future releases. In the initial product release, this value is zero.
not used
Length of additional data (52)
not used (00,00)
61h (97)
9
reserved (must be 00, 00, 00, 00)
first I/O module slot carrier type: 0 = none
5 = IC200CHS001
10 = IC200CHS002
15 = IC200CHS005
20 = IC200CHS010
25 = IC200CHS011
30 = IC200CHS015
35 = IC200CHS003
second I/O module slot carrier type
third I/O module slot carrier type
fourth I/O module slot carrier type
fifth I/O module slot carrier type
sixth I/O module slot carrier type
seventh I/O module slot carrier type
eighth I/O module slot carrier type
not used
Length of additional data (00, 00)

5-9

5
Power Supply and Carriers Configuration Data Format (continued)
(Byte in
Message)

(Byte in
Record)

58, 59
60
61
62,…, 65
66

0, 1
2
3
4,…, 7
8

67
68
69
70
71
72
73
74
75
76
77
78
79
80,…, 81
82, 83

9
10
11
12
13
14
15
16
17
18
19
20
21
22,…., 23
24, 25

Byte Description
Must be 00, 00
61h (97)
0Ah (10)
Reserved (must be 00, 00)
first booster PS Carrier type:
0 = none
5 = IC200PWR001
10 = IC200PWR002
15 = IC200PWR101
20 = IC200PWR102
40 = IC200PWB001 (carrier)
first booster PS, Power Supply type (see above)
second booster PS Carrier type
second booster PS, Power Supply type
third booster PS Carrier type
third booster PS, Power Supply type
fourth booster PS Carrier type
fourth booster PS, Power Supply type
fifth booster PS Carrier type
fifth booster PS, Power Supply type (see above)
sixth booster PS Carrier type
sixth booster PS, Power Supply type
seventh booster PS Carrier type
seventh booster PS, Power Supply type
Reserved (must be 00, 00)
Additional Length (00, 00)

The “bytes in message offsets” are shown for configuration data included in a Read
Configuration Data Reply datagram. For inclusion in a Write Configuration Data
datagram, each offset is increased by one.

5-10

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
Network Interface Unit Configuration Data Format (Rack 0, slot 1)
(Byte in
Message)
6, 7

(Byte in
Record)
0, 1

Byte Description

major type (03=NIU)

minor type (01)

10,…, 13

4,…, 7

15,…, 29

9,…, 23

not used, must be 0

30, 31

24, 25

Length of additional data (52)

32, 33
34

0, 1
2

not used (00,00)

reserved (must be 00, 00, 00, 00)
autoconfiguration enable (enabled=1)

not used (00,00)
major type (05=Expansion Module)

36,…, 39
40,…, 55

4,…, 7
8,… 23

reserved (must be 00, 00, 00, 00)
not used (00,00)

Expansion Transmitter Present (00=no, 01=yes)

56, 57

24, 25

Length of additional data (00, 00)

58
59

0
1

Redundancy and BSM (see below)
Report faults (enable=0, disable=128)

Serial Bus Address (SBA) 0-31. 255 = factory default. Note: the factory
default settings for SBA and baud rate must be changed to valid values
before commanding the NIU to use configuration values for SBA or baud
rate.
Baud Rate(read only): 0 = 153.6Kb ext 1 = 153.6 Kb std 2 = 76.8 Kb 3 =
38.4 Kb, 15=factory default (see above).
Default time: 0 =3 bus scans, 25 = 2.5 seconds, 100 = 10.0 seconds

63, 64
65,…, 68

5, 6
7,…, 10

Status Table Address (used only by Series Six PLC host)
47h, 4eh, 49h, 55h (“GNIU”)

69,…, 81

11,…, 23

not used (00)

82, 83

24, 25

Byte 58

Additional Length (00, 00)
4

0
BSM State (0=bus A, 1=bus B) READ ONLY
Use long default time (1 = yes, 0=no)
BSM Controller (1 = yes, 0 = no)
BSM Forced (1 = yes, 0 = no) READ ONLY
CPU Redundancy ( 00 = no redundancy
01 = Hot standby
10 = Duplex
11 = reserved )
Duplex Default State
Configuration Protection READ ONLY

GFK-1535A

Chapter 5 Datagrams

5-11

5
Expansion Receiver Module Format (Rack 1-7, slot 1)

5-12

(Byte in
Message)

(Byte in
Record)

Byte Description

6, 7

0, 1

major type (05=Expansion Module

Type of Expansion Receiver (02=Isolated, 03=Non-isolated)

10,…, 13

4,…, 7

not used (must be 0)

14,…, 29

8,…, 23

not used (must be 0)

30, 31

24, 25

Length of additional data (0)

not used (must be 0)

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
I/O Module Format
Configuration data follows the same format for all non-intelligent I/O modules,
analog or discrete, input, output or mixed. The configuration datagram contains a
VersaMax configuration message header, a rack/slot header, fixed I/O configuration
fields, variable-length configuration fields and module-specific data. The total
length of fixed and variable I/O configuration fields and module-specific data must
be a multiple of 26 bytes. Pad bytes set to a value of 0 are appended to the end of
the module-specific data to meet this requirement. Fixed and variable-length
configuration fields appear according to the mapping shown in the table below.

I/O Module Format (Rack 0-7, slot 2-9)
(Byte in
Message)

(Byte in
Record)

6, 7

0, 1

Byte Description
Rack/slot header
secondary board ID (MSB in 0, LSB in 1)

8, 9

2, 3

10,…, 13

4,…, 7

ASCII string. Set to zeros during auto-configuration, the programmer
may fill this field with an arbitrary identification string.

primary board ID (MSB in 2, LSB in 3)

14,,…, 15

8,…, 9

Length of additional data (excluding pad bytes)

16,…, 29

10,…, 23

30, 31

24, 25

not used (must be 0)
Length of additional data (excluding pad bytes)
Fixed I/O configuration fields

32, 33

0, 1

secondary board ID (same as above.)

34, 35

2, 3

primary board ID(same as above)

36, 37

4, 5

offset from the start of fixed I/O configuration fields to module-specific
data.The length of module-specific data is given at offset 18 below.

38, 39

6, 7

Number of discrete input reference description fields listed in the
input segments list below. (may be 00)

40, 41

8, 9

Number of discrete output reference description fields listed in the
output segments list below. (may be 00)

42, 43

10, 11

Number of analog input reference description fields listed in the input
segments list below. (may be 00)

44, 45

12, 13

Number of analog output reference description fields listed in the
output segments list below.(may be 00)

46, 47

14, 15

Module setup, a bitmapped word
bit 0 indicates whether defaults are defined in the configuration
structure. If this bit is ‘1’, then input segments mode, output
segments mode, default input values and default output values
fields are included below.
bit 1 enables fault reporting for the module.
bits 2-15 are reserved, must be set to zero.

GFK-1535A

48, 49

16, 17

Reserved (must be 00)

50, 51

18, 19

Length in bytes of module-specific data

52, 53

20, 21

Reserved (must be 00)

54, 55

22, 23

Reserved (must be 00)

Chapter 5 Datagrams

5-13

5
I/O Module Format (Rack 0-7, slot 2-9) (continued)
(Byte in
Message)

(Byte in
Record)

Byte Description
Optional I/O configuration fields

56,… N

Input segments list, an eight-byte reference description field for each
discrete or analog input segment, see below.
Output segments list, an eight-byte reference description field for
each discrete or analog output segment.
Input segments mode, a bitmapped word with a bit representing each
reference description in the input segments list. If the bit is ‘1’, then
inputs hold last state. If the bit is ‘0’, then the inputs default to values
in the default input values field below.
Output segments mode, a bitmapped word with a bit representing
each reference description in the output segments list. If the bit is ‘1’,
then outputs hold last state. If the bit is ‘0’, then the outputs default to
values in the default output values field below.
Default input values (one byte for each byte of inputs defined for
module)
Default output values (one byte for each byte of outputs defined for
module)
Module-specific data
Context dependent data fields
Pad bytes (must be 00) round the bytes in the record up to the next
larger multiple of 26.

Reference Description Field
(Byte in
Message)

(Byte in
field)

varies

0
1

5-14

Byte Description
Sequence number, an arbitrary value that controls the order
in which segments are reported.
Reference type:
discrete input reference, %I = 16
discrete output reference, %Q = 18
analog input reference, %AI = 10
analog output reference, %AQ = 12

2,3

Byte offset within reference memory. For analog references,
this must be an even number. During auto-configuration, the
GNIU sets this field to the next available reference address.

4,5

The byte length of memory used by this segment. For an
analog module, this is the number of channels multiplied by
two. For a discrete module, this is the number of points
divided by eight, rounded up.

6,7

Offset from the start of fixed I/O configuration fields to the
beginning of default values associated with this segment.

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
The NIU fills out the configuration data fields based on the content of the primary
and secondary board ID fields. The NIU reads these fields from the I/O module. Bit
fields in the module board ID indicate whether the module is discrete or analog, the
number of input points or channels, the number of output points or channels and
whether diagnostic bits are returned by the module. The NIU calculates values of
the fixed and variable-length configuration fields from these parameters.
The primary and secondary board ID fields in Write Configuration Data and Read
Configuration Data datagrams are transmitted with the most significant byte in the
lowest memory location or transmitted first in time. The least significant byte
follows. All other word length data fields appear in the opposite order.

14
1

GFK-1535A

NON-INTELLIGENT I/O Board_id REGISTER
byte 0
byte 1
13
12
11
10
9
8
7
6
5
4
3
2
0
0
Module
Addtl data
diag bits
output
type
points or
channels

1
0
input points
or channels

module type

00 = discrete DC module
01 = discrete AC module
10 = analog voltage module
10 = analog current module

addtl data

analog module:
discrete module:

diag bits

The number of diagnostic bits per point or channel

output
points/channels

For discrete modules, this is the number of pairs of output points
for the module;
For analog modules, this is the number of analog output channels
for the module.

input
points/channels

For discrete modules, this is the number of pairs of input points
for the module;
For analog modules, this is the number of analog input channels
for the module.

Chapter 5 Datagrams

0 = voltage,
always = 0

1 = current

5-15

Module-specific data is unique to the type of module. For analog and discrete I/O
modules, two bytes of module-specific data are returned. The content of these bytes
is defined in the following tables.

15
0

13
0

12
0

11
0

DISCRETE MODULE-DEPENDENT DATA
10
9
8
7
6
5
4
0
0
0
0
0
0
0

3
0

2
IN

0
FS

Interrupts enabled

TRUE indicates the module is configured to interrupt
the head end

Filter Selection

0 = 0 ms
1 = 1 ms
2 = 7 ms

15
0

5-16

14
0

13
0

12
0

BiPolar

11
0

ANALOG MODULE-DEPENDENT DATA
10
9
8
7
6
5
4
0
0
0
0
0
0
0

3
0

2
0

1
0

0
BP

0 = unipolar
1 = bipolar

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
Example: Configuration message for IC200MDD844
The following example shows the Read Configuration Data Reply datagram for a
mixed discrete I/O module, the IC200MDD844. This module contains a 16-point
output board as its primary board and a 16-point input board as its secondary slot.

GFK-1535A

(Byte in
Message)

(Byte in
Record)

Content

0
1, 2
3
4,5

0
82
3
0, 0

6, 7

0, 1

0x80, 0x08

8, 9

2, 3

0x80, 0x80

10,…, 13

4,…, 7

14, 15
16,…, 29
30, 31

8, 9
10,…, 23
24, 25

0x44, 0x38,
0x34, 0x34
50, 0
0
52, 0

32, 33

0, 1

0x80, 0x08

34, 35

2, 3

0x80, 0x80

36, 37

4, 5

48, 0

38, 39

6, 7

1, 0

40, 41

8, 9

1, 0

42, 43

10, 11

0, 0

44, 45

12, 13

0, 0

46, 47

14, 15

3, 0

48, 49
50, 51
52, 53
54, 55

16, 17
18, 19
20, 21
22, 23

0, 0
2, 0
0, 0
0, 0

Chapter 5 Datagrams

Byte Description
VersaMax configuration message header
Rack (e.g., Rack 0, the rack containing the GNIU)
Message length (e.g., 82 bytes total length)
Slot (e.g., 3, the second I/O slot)
Offset into configuration data
(e.g., zero because the configuration fits in one message)
Rack/slot header
secondary board ID (e.g., the ID is 0x8008. The LSB is in byte 0, and the MSB is
in byte 1.)
primary board ID (e.g., the ID is 0x8080. The LSB is in byte 2, and the MSB is in
byte 3.)
ASCII string. Set to zeros during auto-configuration, the programmer may fill this
field with an arbitrary identification string. (e.g., this is the ASCII label “D844”)
Length of additional data, excluding pad bytes
not used (must be 0)
Total Length of additional data (e.g., 52 bytes)
Fixed I/O configuration fields
secondary board ID (same as above.)
(e.g., discrete DC type, no diagnostic bits, no outputs, eight pairs of inputs)
primary board ID (same as above)
(e.g., discrete DC type, no diagnostic bits, eight pairs of outputs, no inputs; there
are two boards in this module.)
offset from the start of fixed I/O configuration fields to module-specific data. The
length of module-specific data is given at offset 18 below.
Number of discrete input reference description fields listed in the input
segments list below. (may be 00)
Number of discrete output reference description fields listed in the output
segments list below. (may be 00)
Number of analog input reference description fields listed in the input segments
list below. (may be 00)
Number of analog output reference description fields listed in the output
segments list below.(may be 00)
Module setup, a bitmapped word
bit 0 indicates whether defaults are defined in the configuration structure. If
this bit is ‘1’, then input segments mode, output segments mode, default input
values and default output values fields are included below.
bit 1 enables fault reporting for the module.
bits 2-15 are reserved, must be set to zero.
(e.g., defaults are defined and fault reporting is enabled by this setting.)
Reserved (must be 00)
Length in bytes of module-specific data (e.g., two bytes)
Reserved (must be 00)
Reserved (must be 00)

5-17

5-18

(Byte in
Message)

(Byte in
Record)

Content

0
1, 2
3
4,5

0
82
3
0, 0

6, 7
8, 9
10,…, 13

0, 1
2, 3
4,…, 7

14,…, 29
30, 31

8,…, 23
24, 25

0x80, 0x08
0x80, 0x80
0x44, 0x38,
0x34, 0x34
0
50, 0

32, 33

0, 1

0x80, 0x08

34, 35

2, 3

0x80, 0x80

36, 37

4, 5

48, 0

38, 39

6, 7

1, 0

40, 41

8, 9

1, 0

42, 43

10, 11

0, 0

44, 45

12, 13

0, 0

46, 47

14, 15

3, 0

48, 49
50, 51
52, 53
54, 55

16, 17
18, 19
20, 21
22, 23

0, 0
2, 0
0, 0
0, 0

Byte Description
VersaMax configuration message header
Rack (e.g., Rack 0, the rack containing the GNIU)
Message length (e.g., 82 bytes total length)
Slot (e.g., 3, the second I/O slot)
Offset into configuration data
(e.g., zero because the configuration fits in one message)
Rack/slot header
secondary board ID
primary board ID
ASCII string. Set to zeros during auto-configuration, the programmer may fill this
field with an arbitrary identification string. (e.g., this is the ASCII label “D844”)
not used (must be 0)
Length of additional data (e.g., 50 bytes)
Fixed I/O configuration fields
secondary board ID (same as above.)
(e.g., discrete DC type, no diagnostic bits, no outputs, eight pairs of inputs)
primary board ID (same as above)
(e.g., discrete DC type, no diagnostic bits, eight pairs of outputs, no inputs; there
are two boards in this module.)
offset from the start of fixed I/O configuration fields to module-specific data. The
length of module-specific data is given at offset 18 below.
Number of discrete input reference description fields listed in the input
segments list below. (may be 00)
Number of discrete output reference description fields listed in the output
segments list below. (may be 00)
Number of analog input reference description fields listed in the input segments
list below. (may be 00)
Number of analog output reference description fields listed in the output
segments list below.(may be 00)
Module setup, a bitmapped word
bit 0 indicates whether defaults are defined in the configuration structure. If
this bit is ‘1’, then input segments mode, output segments mode, default input
values and default output values fields are included below.
bit 1 enables fault reporting for the module.
bits 2-15 are reserved, must be set to zero.
(e.g., defaults are defined and fault reporting is enabled by this setting.)
Reserved (must be 00)
Length in bytes of module-specific data (e.g., two bytes)
Reserved (must be 00)
Reserved (must be 00)

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

5
Example: Configuration message for IC200MDD844, a mixed discrete I/O
module (continued)
(Byte in
Message)

GFK-1535A

(Byte in
Record)

Content

56
57
58, 59

24
25
26, 27

1
16
17, 0

60, 61
62, 63

28, 29
30, 31

2, 0
44, 0

64
65
66, 67

32
33
34, 35

2
18
8, 0

68, 69
70, 71
72

36, 37
38, 39
40

2, 0
46, 0
0, 0

0, 0

76
77

44
45

0
0

78
79

46
47

0xFF
0xFF

81
82, 83

49
50, 51

0
0, 0

Chapter 5 Datagrams

Byte Description
Optional I/O configuration fields
Input segments list, an eight-byte reference description field for each discrete or
analog input segment.
(e.g., one discrete input segment)
Sequence number (e.g., 1)
Reference type (e.g., discrete input, %I)
Offset in reference memory; this value filled in by programmer indicates these
are bits %I17 through %I32)
Byte length (e.g., two bytes for 16 bit input segment)
Offset to defaults (e.g., see offset 44 below)
Output segments list, an eight-byte reference description field for each discrete
or analog output segment.
(e.g., one discrete input segment)
Sequence number (e.g., 2)
Reference type (e.g., discrete output, %Q)
Offset in reference memory; this value filled in by programmer indicates these
are bits %Q8 through %Q24)
Byte length (e.g., two bytes for 16 bit output segment)
Offset to defaults (e.g., see offset 46 below)
Input segments mode, a bitmapped word with a bit representing each reference
description in the input segments list. If the bit is ‘1’, then inputs hold last state. If
the bit is ‘0’, then the inputs default to values in the default input values field
below.
(e.g., only bit 0 is meaningful; use of default values is indicated)
Output segments mode, a bitmapped word with a bit representing each
reference description in the output segments list. If the bit is ‘1’, then outputs
hold last state. If the bit is ‘0’, then the outputs default to values in the default
output values field below.
(e.g., only bit 0 is meaningful; use of default values is indicated)
Default input values
defaults for input points 0-7 (e.g., all zeros)
defaults for input points 8-15 (e.g., all zeros)
Default output values
defaults for output points 0-7 (e.g., all ones)
defaults for output points 8-15 (e.g., all ones)
Module-specific data
Context dependent data fields
bit map for discrete module parameters
(e.g., select input filter = 7 milliseconds, Interrupts Disabled)
reserved bits
Pad bytes extend the length of this record to 52 bytes (=2x26)

5-19

5
Set NIU Operating Mode
Subfunction Code: 39 hex
This datagram can be used to set the operating mode of the NIU.
Byte No.

Byte Description

Mode

This message has two copies of the mode parameter. These copies must be equal for
the command to be accepted by the NIU.
If you disable I/O scanning, the NIU sends no inputs and receives no outputs.

7 6 5 4

3 2

1 0
I/O Scan Enable/Disable (1 = enable, 0 = disable)
Unused (must be 0)

5-20

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

Chapter

Redundancy

6
Most systems use only one CPU to control the I/O on the Genius bus. CPU
redundancy, which can be used for backup CPU/Bus Controller protection in critical
applications, is described in detail in the Genius documentation. The discussion that
follows summarizes how the NIU can fit into a Genius CPU Redundancy system.

GFK-1535A

CPU/Bus Controller Redundancy
Using the NIU in a Genius Bus Redundancy System

6-1

6
CPU/Bus Controller Redundancy
In CPU redundancy, two Bus Controllers on the same bus can send control outputs
at the same time. Both Bus Controllers automatically receive inputs and fault
reports from all devices on the bus that have been configured as being in “CPU
Redundancy” mode. The Bus Controllers must use serial bus addresses 30 and 31.
VersaMax I/O Stations can be used on a bus controlled by redundant CPUs/Bus
Controllers.

Bus Controller
(Device 30)

Bus Controller
(Device 31)

NIU

How the two sets of outputs from the dual CPUs are handled by an NIU depends on
whether the NIU is set up for Hot Standby or Duplex redundancy, as explained
below. If the station contains any analog modules, the only form of CPU
redundancy permitted is Hot Standby.

Hot Standby CPU Redundancy
An NIU configured for Hot Standby mode is normally controlled by the Bus
Controller assigned to serial bus address 31. If no outputs are available from 31 for
three bus scans, the NIU accepts outputs from the Bus Controller assigned to serial
bus address 30. If outputs are not available from either Bus Controller, outputs go
to their configured defaults or hold their last state. In Hot Standby redundancy,
Bus Controller 31 always has priority; when it is online, it has control of the
outputs.

Duplex CPU Redundancy
An NIU configured for Duplex mode compares outputs it receives from the two bus
controllers to determine if they match. If corresponding outputs are the same, the
NIU sets the output to that state. If corresponding outputs are not the same, the NIU
sets the output to its configured ON or OFF Duplex Default State. If either bus
controller stops sending outputs to an NIU, its outputs are directly controlled by the
remaining device. Only discrete I/O modules can operate in Duplex redundancy
mode; do not use Duplex mode if the station contains any analog I/O modules.

6-2

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

6
Using the NIU in a Genius Bus Redundancy System
In Genius bus redundancy, there are two bus cables each connected to a Bus
Controller or PCIM. I/O devices such as the NIU may be connected to either one
bus of the pair, or to both. A device that is connected to both busses actually
communicates on only one bus at a time. Before the alternate bus can be used for
communications, a bus switchover must occur and the device must “log in” with the
Bus Controller(s) on the alternate bus.
The NIU contains a built-in bus switching relay that is used to switch busses in a
dual bus system. Other types of devices with this capability are Field Control BIUs,
Bus Switching Modules and Series 90-70 Remote I/O Scanner modules. These are
the only types of devices that can be directly connected to both redundant bus
cables.
An NIU cannot be used as the BSM Controller for a bus stub. Other devices cannot
be located on a stub downstream of an NIU.

Redundant Bus Configurations
Many different redundant bus configurations are possible. Three basic ways of
using an NIU with a redundant bus are described below.

An NIU can be installed directly on both cables of the dual bus pair. The
NIU is configured to operate as a bus switching device in addition to
performing its normal functions. Here, two NIUs are installed on a dual bus.
Each NIU would be set up as a bus switching device.
Bus A
Bus B

NIU

GFK-1535A

Chapter 6 Redundancy

NIU

6-3

An NIU can be located on one bus of a redundant bus pair, if bus
redundancy is not needed for the modules in that station. In this example, the
NIU on the left is connected to both Bus A and Bus B and is configured as a
bus switching device. The NIU on the right, which serves non-critical I/O
modules, is connected to Bus A only, and is not configured as a bus switching
device.
Bus A
Bus B
NIU

NIU

An NIU can be located on a bus stub. A Network Interface Unit can also be
located on a bus stub, which is a short length of unterminated cable
downstream of another type of bus switching device, such as a Genius I/O
block/Bus Switching Module combination, or a Remote I/O Scanner connected
to a dual bus. Because the bus stub cable itself is not redundant, this type of
installation does not provide as much protection as connecting directly to a dual
bus. The bus switching device to which the bus stub is connected can be
another Genius block with a Bus Switching Module attached, as shown below,
or a Series 90-70 Remote I/O Scanner.

In this example, there are two I/O stations installed on a bus stub. Each is
configured as “BSM Present” but not configured as a “BSM Controller”
Bus A

Bus B

NIU

Bus
Switching
Module
Genius Block
Acting as a
BSM Controller

Up to 7 Additional Devices on the Bus Stub

Up to seven devices can be installed on a bus stub. Each device on a bus stub
counts toward the total of 32 devices on the Genius bus.
Restrictions on the number and length of bus stubs that may be used on a dual bus
are explained in the Genius I/O System and Communications User's Manual.
6-4

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

Appendix

Operation of the Genius Bus

A
This section describes the characteristics of the bus that links Genius devices. This
information supersedes the equivalent text portion of chapter 2 of the Genius I/O
System and Communications Manual (GEK-90486-1) “The Communications Bus”.
This section includes the following information:

GFK-1535A

Electrical interface
Serial bus waveforms
Maximum bus length
Serial data format
Genius transceiver electrical specifications
Bus errors

A-1

A
Electrical Interface
All stations must receive in order to track the present token value and take their
appropriate turn on the bus, regardless whether the data is to be used locally. The
transmit sequence is the same as the serial bus address (SBA) set into each location
during configuration. A simplified interface circuit is shown below:
Wiring Terminals
+ REF

SER1

LOCAL
SUPPLY

SER2

COMP

RX+

COMP

RX-

+5 to 10 V

SHIELD
OUT
SER1

- REF

SER2
SER2

SHIELD
IN

TX+

TX-

ISOLATION

LOCAL
COMMON

INTERFACE
LOGIC

CHASSIS
GROUND

Signal coupling to the bus is via a high frequency, high isolation pulse transformer.
The pulse waveforms are bipolar to reduce DC baseline offsets in the waveform.
The daisy-chained bus is shown on the left above. The SER 1 and SER 2 lines are
tapped at the intermediate locations along the bus. These connections must be
consistent since the signal is polarized. The shield of the cable is broken into
segments at each location. Each shield segment is DC grounded at one end
(SHIELD OUT), and terminated with a small capacitor at the other (SHIELD IN).
The segmenting breaks up long ground loop paths. The capacitor termination
reduces common mode noise from high frequency pickup, while preventing large
ground loop currents in the shield at low frequencies.
The alternately switching transistors produce a negative pulse followed by a
positive pulse across SERIAL 1 relative to SERIAL 2. The bit waveform is a series
of these pulses. The transformer provides isolation (2500 volts test) between the
bus and the local logic, permitting these to be at different voltages. The internal
resistors in each line provide current limit and some termination during
transmission.
The balanced (differential) signals on the twisted pair provide high noise immunity
due to the magnetic (H field) cancellation effect of the twisting, as well as electric
(E field) reduction by the shielding. Most remaining noise pickup is common mode:
the transformer provides a high common mode noise rejection by looking only at
the differential signal across the SER 1-2 lines. The two input comparators detect
the positive polarity input pulses separately from the negative; these are sent to a
custom interface logic chip which digitally filters these for timing and sequence,
then reconstructs the NRZ digital data. Voltages between the two thresholds are
ignored. This filtering and the high input threshold of the comparators are highly
effective in rejecting both random impulse noise and low-level line reflections.
Finally a CRC-6 checksum check is performed before the data is sent to the local
processor (not shown).
A-2

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

A
Serial Bus Waveforms
The actual waveforms seen on the cable depend on the cable impedance and the
distance from the station presently transmitting. A data “0” is a series of three AC
pulses, while a “1” is no pulse.
+Vp
+Vr
-Vr
-Vp
0

1
t=

baud rate

SERIAL 1 VOLTAGE RELATIVE TO SERIAL 2

Use caution when connecting instrumentation to the bus. A differential probe or a
summation of two probes relative to ground is required. Inadvertent grounding of
one side of the bus can cause loss of data or data errors.
The pulse frequency is three times the baud frequency, for example 460.8 KHz at
153.6 Kb.
The peak transmitted voltage Vp and the receiver thresholds Vr are per the electrical
specification in this section. The peak voltages measured will decline with distance
along the cable from the transmitting station, so different stations will have varying
amplitudes. The wave shape will also become more rounded with distance.
The minimum amplitude pulses seen during a “0” should exceed the receiver
threshold Vr of 900 millivolts by 50% (about 1.4 volts) for best reliability. An
occasional pulse at or below the threshold may still not cause the bit to be missed,
due to a voting algorithm in the logic, however.
Likewise, no pulses greater than Vr should exist during logic “1” intervals.
Occasional extra pulses during this interval are also rejected by the logic.
Line reflections will show up as notch distortion during the pulse or low level pulses
during “1” intervals, and their appearance is synchronized to the baud frequency.
These cause no problem if they do not cause violation of the amplitude criteria of
the previous paragraphs.
The Serial 1 and Serial 2 lines should always have a termination resistor equal to the
characteristic impedance of the cable connected at each extreme end.

GFK-1535A

Appendix A Operation of the Genius Bus

A-3

A
Maximum Bus Length
Three effects limit the maximum length bus available at any baud rate:
1. Voltage attenuation
2. Waveform distortion (frequency dispersion)
3. Propagation delays

Attenuation
The transmitter output levels and receiver thresholds determine the maximum
attenuation that can be tolerated. This is the principal determinant when using
recommended cables.

Distortion
Waveform distortion is due to the limited bandwidth of wire media, which causes
the various frequency components of a pulse waveform to travel at different speeds
and arrive separately in time (called dispersion). As a result, the received pulse
appears rounded and distorted. The signal at the extreme end from the transmitter
may look rounded and skewed as shown below. Distortion is most apparent near the
beginning and end of a pulse train where it may appear as a change in phase or a
frequency shift. Critical timing for a logic 0 transmission is shown below in a more
detailed version of the waveform:
Tw

+Vr

-Vr
Tp/2

Tp/2

Note the first and last half-cycle look wider. The most critical to operation is the
first full cycle of the first start bit of the transmission. Detection of this pulse
establishes the time synchronization of the receiver to the incoming waveform.
Missing this first pulse does not cause the data to be missed, but may compromise
the noise immunity with respect to extra or missing pulses. The frequency of the AC
pulse is 3X the baud rate as noted earlier. This means the normal period Tp(normal)
is:
2.17 microseconds at 153.6 Kb
4.34 microseconds at 76.8 Kb
8.68 microseconds at 38.4 Kb.

A-4

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

The half cycle pulse width, when measured between the positive and negative
receiver thresholds, denoted as Tp/2 in the figure, will vary along the waveform due
to dispersion, and resembles a frequency shift.. The digital input filter essentially is
a band pass filter which looks at the half cycle timing Tp/2, and the duration above
the thresholds, Tw. The limits are:
Tp/2 = 0.6 Tp(normal) maximum
Tw = 0.188 Tp(normal) minimum
These measurements can be taken when evaluating the maximum length of an
unspecified cable. Dispersion is much less of a problem with fiber optic links since
the media is much wider bandwidth, and therefore has less distortion.

Propagation Delay
The propagation delay is caused by travel time of the signal down the cable. Typical
signal velocity in data grade cables is around 65- 78% of the speed of light. This
requires about 3 microseconds to travel a 2000 foot long bus. This is about half a
bit time at 153.6 Kb. This skew could affect the bus access sequence since only one
bit of quiet bus (skip) time is usually allocated between transmission of adjacent
addresses. The signal must reach all devices on the bus within the period of one bit.
Propagation delay causes the ultimate limitation in bus length, even with ideal
media. Propagation speed through fiber optic is not significantly different than wire,
and delays through the interfaces must be accounted for.

GFK-1535A

Appendix A Operation of the Genius Bus

A-5

A
Serial Data Format
The Genius protocol produces maximum throughput of data by using a minimum
overhead of control and synchronizing characters.
Each character is 11 bits long, comprising a start bit (always 0), next a control bit,
followed by 8 bits of data, sent LSB first. The last bit is a stop bit, always 1.
Successive characters are sent with no time space between them. The control bit
indicates the type of character being sent. A 1 indicates a control character, and 0 a
data character.
A minimum transmission has a Start character, one or more data characters, and a
Stop character. The Start character data contains the address and whether the
transmission is directed to a specific address or broadcast to all. The End character
contains the CRC-6 checksum. Complex transmissions may have additional start
and end of block characters to break up the message into blocks of data. For
example, a Bus Controller can send device specific messages (blocks of data) to all
devices on the bus during one transmission cycle.

Bus Access
All devices receive the current SBA and the stop character even though the data is
not used. After receiving the stop control character, each device starts a timer. The
time delay is equal to a skip time, times the difference between the device SBA and
the last SBA received. The device will transmit after the time delay if no other start
bits are detected first. Thus each device takes turn in order of SBA. Unused SBAs
result in longer times between messages. All devices must detect messages within
this skip time delay. A bus “collision” (two sources transmitting simultaneously)
results if this sequence is missed. The skip time is equal to one bit period, except at
the 153.6e rate, where it is two bit periods long. The longer interval accommodates
greater propagation delays cause by longer bus cables or fiber optic or other
repeaters. The worse case is when adjacent SBAs are physically located at opposite
ends of a long bus. For example, assume SBA 4 and 6 are at one end of a 2000 foot
bus and SBA5 at the other, operating at 153.6s Kb. When SBA 4 end character is
detected, SBA6 immediately starts timing 2 skip times (52 µSec) to start of its
transmission. SBA5 receives the end character 3 µSec later, and starts timing 1 skip
time (26 µSec). Thus SBA 5 will start transmitting 29 µSec after SBA 4 quit. This
allows 23µSec for the signal to get back to SBA6 to cancel it's transmission turn.
The 3µSec transmission delay leaves only 20 µSec to do this and avoid a collision
between SBA5 and 6.
Bus collisions result in missing data or detected CRC errors. Problems resulting
from bus collisions can be fixed by skipping an SBA, resequencing SBAs in order
along the bus, going from 153.6s baud to the 153.6e, or a lower baud rate.
A-6

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

A
Genius Transceiver Electrical Specification
Property

Min

Max

Normal peak voltage Vp into 78 ohm terminated cable (1)

3.5 volts

5.5 volts

Normal peak voltage Vp into 150 ohm terminated cable (1)

6.0 volts

9.5 volts

Rated bus impedance (2)

78 ohms

Maximum output voltage (SER 1 and 2 open) (3) :

Peak: 35 volts
RMS: 15 volts

Maximum output current (SER 1 and 2 shorted together) :
Transmitter source resistance

Peak: 180 milliamp
RMS: 50 milliamp
80 ohms

Transmitter source inductance (transformer leakage inductance)
Receiver input threshold; +Vr, -Vr (4)
Receive mode input impedance
Receive mode load inductance (transformer shunt inductance)
Receiver common mode rejection (DC to 1 MHZ)

140 ohms
10 microhenries

0.7 volt

1.1 volt

10 K ohm
6 millihenries

12 millihenries

60 dB

Shield capacitor termination

0.1 microfarad

Isolation, serial bus to circuit, continuous

240 volts AC

(1) Vp may vary among various module types.
(2) Rated load is half cable impedance when termination is included.
(3) Peak open circuit voltage contains underdamped ringing due to lack of
termination.
(4) Input voltages between +Vr and -Vr thresholds are ignored.

Bus Errors
Most capacitively- and magnetically-coupled noise shows up as common mode
voltage on the bus. The bus provides a 60 dB common mode rejection ratio. A noise
spike above 1000 volts would be required to corrupt the data. The bus receivers
filter out corrupted data and perform a 6-bit cyclic redundancy check to reject bad
data. Corrupted signals due to noise show up as missed data rather than incorrect
data. The bus continues operating to the maximum extent possible when bus errors
are detected; random bus errors do not shut down communications. Bad data is
rejected by the receiving device and excessive errors are reported to the controller.

GFK-1535A

Appendix A Operation of the Genius Bus

A-7

Performance Data

Appendix

B
This section lists approximate scan times in microseconds for modules in a
VersaMax Genius NIU I/O Station. Each module was configured with its default
settings and user power was applied when applicable. This information is provided
as a guideline for determine I/O scanning times. Actual timing may vary.
Module
Catalog Number
IC200ALG230
IC200ALG240

Description

Main Rack

Expansion Rack
Non-isolated Extended or
Isolated

Analog Input Module, 12 Bit Voltage/Current 4 Channels

448

Analog Input Module, 16 Bit Voltage/Current 1500VAC
Isolation, 8 Channels

968

1480

5857

IC200ALG260

Analog Input Module, 12 Bit Voltage/Current Isol. 8 Ch.

737

IC200ALG320

Analog Output Module, 12 Bit Current, 4 Channels

1258

IC200ALG321

Analog Output Module, 12 Bit Voltage 4 Channels, 0 to
+10VDC Range

1258

IC200ALG322

Analog Output Module, 12 Bit Voltage 4 Channels, –10 to
+10VDC Range

1258

IC200ALG331

Analog Output Module, 16 Bit Voltage/Current, 1500VAC
Isolation, 4 Channels

1652

2156

6644

IC200ALG430

Analog Mixed 12 Bit Input Current 4 Channels / Output
Current 2 Channels

1308

IC200ALG431

Analog Mixed 12 Bit 0 to +10VDC Input 4 Channels /
Output 0 to +10V 2 Channels

1308

IC200ALG432

Analog Mixed 12 Bit –10 to +10VDC Input 4 Channels /
Output –10 to +10V 2 Channels

1308

IC200ALG620

Analog Input, 16 Bit RTD, 4 Channels

843

1299

5257

IC200ALG630

Analog Input, 16 Bit Thermocouple, 7 Channels

897

1398

5731

IC200MDD840

Mixed 24VDC Positive Logic Input Grouped 20 Point/
Output Relay 2.0A per Point Grouped 12 Point Module

821

1009

2836

IC200MDD841

Mixed 24VDC Positive Logic Input 20 Point/ Output 12
Point / 4 High-Speed Counter, PWM or Pulse Train Points

6593

7905

20744

IC200MDD842

Mixed 16 Point Grouped Input 24VDC Pos/Neg Logic / 16
Pt Grouped Output 24VDC Pos. Logic 0.5A w/ESCP

777

873

1848

IC200MDD843

Mixed 24VDC Positive Logic Input Grouped 10 Point /
Output Relay 2.0A per Point 6 Point Module

659

763

1687

GFK-1535A

B-1

B
Module
Catalog Number

B-2

Description

Main Rack

Expansion Rack
Non-isolated

IC200MDD844

Mixed 24 VDC Pos/Neg Logic Input Grouped 16 Point
/ Output 12/24VDC Pos. Logic 0.5A 16 Point Module

780

867

Extended
or Isolated
1842

IC200MDD845

Mixed 16 Point Grouped Input 24VDC Pos/Neg Logic /
8 Pt Relay Output 2.0A per Pt Isolated Form A

660

759

1689

IC200MDD846

Mixed 120VAC Input 8 Point / Output Relay 2.0A per
Point 8 Point Module

675

777

1676

IC200MDD847

Mixed 240VAC Input 8 Point / Output Relay 2.0A per
Point 8 Point Module

675

777

1676

IC200MDD848

Mixed 120VAC Input 8 Point / Output 120VAC 0.5A
per Point Isolated 8 Point Module

675

777

1676

IC200MDL140

Input 120VAC 8 Point Grouped Module

269

322

766

IC200MDL141

Input 240VAC 8 Point Grouped Module

269

322

766

IC200MDL240

Input 120VAC (2 Groups of 8) 16 Point Module

286

390

1256

IC200MDL241

Input 240VAC (2 Groups of 8) 16 Point Module

286

390

1256

IC200MDL329

Output 120VAC 0.5A per Point Isolated 8 Point
Module

400

450

901

IC200MDL330

Output 120VAC 0.5A per Point Isolated 16 Point
Module

516

563

1038

IC200MDL331

Output 120VAC 2.0A per Point Isolated 8 Point
Module

400

450

901

IC200MDL640

Input 24VDC Positive Logic (2 Groups of 8) 16 Point
Module

286

390

1256

IC200MDL650

Input 24VDC Positive Logic (4 Groups of 8) 32 Point
Module

271

363

1225

IC200MDL730

Output 24VDC Positive Logic 2.0A per Point (1 Group
of 8) with ESCP 8 Point Module

469

568

1461

IC200MDL740

Output 24VDC Positive Logic 0.5A per Point (1 Group
of 16) 16 Point Module

516

563

1038

IC200MDL741

Output 24VDC Positive Logic 2.0A per Point (1 Group
of 16) with ESCP 16 Point Module

518

563

1042

IC200MDL742

Output 24VDC Positive Logic 0.5A per Point (2
Groups of 16) with ESCP 32 Point Module

786

881

1870

IC200MDL750

Output 24VDC Positive Logic 0.5A per Point (2
Groups of 16) 32 Point Module

786

881

1870

IC200MDL930

Output Relay 2.0A per Point Isolated Form A 8 Point
Module

400

450

901

IC200MDL940

Output Relay 2.0A per Point Isolated Form A 16 Point
Module

516

563

1038

VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000

GFK-1535A

Index
A
Add modules to autoconfiguration, 4-11
Addition of Module diagnostic, 4-13
Analog outputs, 3-6
Attenuation, A-4
Autoconfiguration, 4-1, 4-2, 4-10

B
BIU data types, 3-3
Bus
access, A-6
cable characteristics, 2-17
cable types, 2-15
electrical interface, A-2
general transceiver specifications, A-7
length, 2-17
lightning transients, 2-19
outdoors, 2-19
repeaters, using, A-4
scan time, 3-4, 3-7
serial data format, A-1, A-6
surge suppression, 2-19
termination, 2-18
unspecified cable type, using, A-4
using other cable types, 2-17
waveforms, A-3
Bus Controller version required, 1-6
Bus Redundancy, 6-3
Bus switching, 6-3
Bus Switching Module, 6-4

C
Cable types, 2-15
CE Mark installation requirements, 2-21
Clearance required, 2-2
Color code on modules, 1-8
Communications
loss of, 3-6
on Genius bus, 3-4
Configuration
clearing, 4-11
datagram format, 5-6
CPU/Bus Controller Redundancy, 6-2
Current draw, 2-10

GFK-1535A

D
Data types for BIU, 3-3
Datagram, 5-1
Datagrams for the BIU
list of, 5-2
Read Configuration Data, 5-6
Read Map, 5-3
Read Map Reply, 5-3
Report Fault datagram format, 5-4, 5-6
DIN rail
mounting, 2-4
type, 2-4
Discrete outputs, 3-6
Documentation, 1-2
Duplex CPU redundancy, 6-2

E
ESD protection
CE Mark requirements, 2-21
Ethernet NIU User’s Manual, 1-2
Extra I/O Module fault, 4-10
Extra Module diagnostic, 4-13

F
Fault Report datagram, 5-4
Faults
Extra I/O Module, 4-10
Fiber optics, 2-19
Field Power LED, 1-8
FTB protection
CE Mark requirements, 2-21

G
Genius systems with Field Control, 1-4
Grounding, 2-19

H
Host computer, 1-6
handles input data from BIU, 3-5
Host CPU, 1-6
Hot inserting modules, 4-11
Hot insertion, 1-3
Hot standby redundancy, 6-2
Humidity, 1-15

Index-1

Index

I
I/O carriers, 1-8
installation, 2-4
I/O data
transfer with host, 3-4
I/O Modules
catalog numbers, 1-9
Inserting modules, 4-11

K
Keying dials on carrier, 1-8

L
Logicmaster 90-70
software version required, 1-6
Loss of Module diagnostic, 4-13

M
Manuals, 1-2
Module color code, 1-8
Module dimensions, 1-8
Module keying, 1-8
Module latch, 1-8
Module orientation on I/O carriers, 1-11
Modules per station, 1-3
Mounting holes, 2-4

O
OK LED, 1-8
Operating mode, 5-20
Output defaults, 3-6
Outputs
sent by host, 3-6

P
PLC types, 1-6
Power supply installation, 2-10
Profibus NIU User’s Manual, 1-2
Propagation delays, A-4

R
Read Configuration datagram, 5-6
Read Map datagram, 5-3
Read Map Reply datagram, 5-3
Redundancy

Index-2

bus

description, 6-3
Reference address assignment, 4-11
Reference Parameters
description, 3-3
Remote I/O Manager Manual, 1-2
Report Fault datagram, 5-4

S
Scan time
I/O modules, B-1
Screws, 2-5
Series 90-30 PLC
Bus Controller version, 1-6
Series 90-70 PLC
Bus Controller version, 1-6
CPU version required, 1-6
handles input data from BIU, 3-5
Series Five PLC
handles input data from BIU, 3-5
Series Six PLC
handles input data from BIU, 3-5
Set BIU Mode datagram, 5-20
Shock, 1-15
Slots, 4-1, 4-2, 4-10
Specifications
System, 1-15
Suppression
at the communications line, 2-19
Surge protection, 2-21
Surge suppressors, 2-19

T
Temperature, 1-15
Terminating the bus, 2-15, 2-18
Thermal Clearance, 2-3
Timing, 3-7

V
VersaMax Modules, Power Supplies, and
Carriers User’s Manual, 1-2
VersaMax PLC User’s Manual, 1-2
Vibration, 1-15
Vibration resistance, 2-4
Voltage attenuation, A-4

VersaMax™ System Genius® Network Interface Unit User's Manual– November 2000 GFK-1535A

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : Yes
Create Date                     : 2001:01:27 21:34:22
Producer                        : Acrobat Distiller 4.0 for Windows
Modify Date                     : 2001:01:30 08:56:50-05:00
Title                           : VersaMax System Genius Network Interface Unit User's Manual, GFK-1535A
Subject                         : GFK-1535A, VersaMax System Genius Network Interface Unit User's Manual
Keywords                        : VersaMax
Author                          : IC200GBI001
Page Count                      : 96
Page Mode                       : UseOutlines

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VersaMax System Genius Network Interface Unit User's Manual, GFK 1535A Gfk1535a GENIUSNIUMODULE

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