Chapter 4 Ch4

User Manual: Chapter 4 DL06 User Manual

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SyStem deSign and

configuration 4

Chapter

In This Chapter

DL06 System Design Strategies ........................................................ 4–2

Module Placement ........................................................................... 4–3

Power Budgeting ............................................................................. 4–5

Configuring the DL06’s Comm Ports ............................................... 4–7

Connecting to MODBUS and DirectNET Networks ........................... 4–9

Non–Sequence Protocol (ASCII In/Out and PRINT) ........................ 4–11

Network Slave Operation ............................................................... 4–12

Network Master Operation ............................................................ 4–18

Network Master Operation (using MRX and MWX Instructions) .... 4–22

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–2

Chapter 4: System Design and Configuration

DL06 System Design Strategies

I/O System Configurations

The DL06 PLCs offer a number of different I/O configurations. Choose the configuration

that is right for your application, and keep in mind that the DL06 PLCs offer the ability to

add I/O with the use of option cards. Although remote I/O isn’t available, there are many

option cards available. For instance:

• Various A/C and D/C I/O modules

• Combination I/O modules

• Analog I/O modules

• Combination Analog I/O modules

A DL06 system can be developed using several different arrangements using the option

modules. See our DL05/06 Options Modules User Manual (D0-OPTIONS-M) on the

website, www.automationdirect.com for detailed selection information.

Networking Configurations

The DL06 PLCs offers the following ways to add networking:

• Ethernet Communications Module s connects a DL06 to high-speed peer-to-peer networks. Any

PLC can initiate communications with any other PLC or operator interfaces, such as C-more, when

using the ECOM modules.

• Data Communications Modules s connects a DL06 to devices using either DeviceNet or Profibus

to link to master controllers, as well as a D0-DCM.

• Communications Port 1 s The DL06 has a 6-pin RJ12 connector on Port 1 that supports (as

slave) K-sequence, MODBUS RTU or DirectNET protocols.

• Communications Port 2 s The DL06 has a 15-pin connector on Port 2 that supports either

master/slave MODBUS RTU or DirectNET protocols, or K-sequence protocol as slave. (MRX

and MWX instructions allow you to enter native MODBUS addressing in your ladder program

with no need to perform octal to decimal conversions). Port 2 can also be used for ASCII IN/OUT

communictions.

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–3

Chapter 4: System Design and Configuration

Module Placement

Slot Numbering

The DL06 has four slots, which are numbered as follows:

Slot 1

Slot 2

Slot 3

Slot 4

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–4

Chapter 4: System Design and Configuration

Automatic I/O Configuration

The DL06 CPUs automatically detect any installed I/O modules (including specialty

modules) at powerup, and establish the correct I/O configuration and addresses. This applies

to modules located in the local base. For most applications, you will never have to change the

configuration.

I/O addresses use octal numbering, starting at X100 and Y100 in the slot next to the CPU.

The addresses are assigned in groups of 8, or 16 depending on the number of points for

the I/O module. The discrete input and output modules can be mixed in any order. The

following diagram shows the I/O numbering convention for an example system. Both

the Handheld Programmer and DirectSOFT 5 provide AUX functions that allow you

to automatically configure the I/O. For example, with the Handheld Programmer AUX

46 executes an automatic configuration, which allows the CPU to examine the installed

modules and determine the I/O configuration and addressing.With DirectSOFT 5, the PLC

Configure I/O menu option would be used.

Automatic

Manual

Manual I/O Configuration

It may never become necessary, but DL06 CPUs allow manual I/O address assignments

for any I/O slot(s) . You can manually modify an auto configuration to match arbitrary

I/O numbering. For example, two adjacent input modules can have starting addresses at

X100 and X200.Use DirectSOFT 5 PLC Configure I/O menu option to assign manual

I/O address. In automatic configuration, the addresses are assigned on 8-point boundaries.

Manual configuration, however, assumes that all modules are at least 16 points, so you can

only assign addresses that are a multiple of 20 (octal). You can still use 8 point modules, but

16 addresses will be assigned and the upper eight addresses will be unused.

WARNING: If you manually configure an I/O slot, the I/O addressing for the other modules

may change. This is because the DL06 CPUs do not allow you to assign duplicate I/O addresses.

You must always correct any I/O configuration errors before you place the CPU in RUN mode.

Uncorrected errors can cause unpredictable machine operation that can result in a risk of personal

injury or damage to equipment.

Slot 1

8pt. Input

X100–X107

Slot 2

16pt. Output

Y100–Y117

Slot 3

16pt. Input

X110–X127

Slot 4

8pt. Input

X130–X137

Slot 1

8pt. Input

X100–X107

Slot 2

16pt. Output

Y100–Y117

Slot 3

16pt. Input

X200–X217

Slot 4

8pt. Input

X120–X127

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–5

Chapter 4: System Design and Configuration

Power Budgeting

The DL06 has four option card slots. To determine whether the combination of cards you

select will have sufficient power, you will need to perform a power budget calculation.

Power supplied

Power is supplied from two sources, the internal base unit power supply and, if required, an

external supply (customer furnished). The D0-06xx (AC powered) PLCs supply a limited

amount of 24VDC power. The 24VDC output can be used to power external devices.

For power budgeting, start by considering the power supplied by the base unit. All DL06

PLCs supply the same amount of 5VDC power. Only the AC units offer 24VDC auxiliary

power. Be aware of the trade-off between 5VDC power and 24VDC power. The amount

of 5VDC power available depends on the amount of 24VDC power being used, and the

amount of 24VDC power available depends on the amount of 5VDC power consumed.

Determine the amount of internally supplied power from the table on the following page.

Power required by base unit

Because of the different I/O configurations available in the DL06 family, the power

consumed by the base unit itself varies from model to model. Subtract the amount of power

required by the base unit from the amount of power supplied by the base unit. Be sure to

subtract 5VDC and 24VDC amounts.

Power required by option cards

Next, subtract the amount of power required by the option cards you are planning to use.

Again, remember to subtract both 5VDC and 24VDC. If your power budget analysis shows

surplus power available, you should have a workable configuration.

Chapter 4: System Design and Configuration

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–6

Chapter 4: System Design and Configuration

DNOTE 1: Auxiliary 24VDC used to power V+ terminal of D0-06DD1/-D sinking outputs.

NOTE 2: If the PLC’s auxiliary 24VDC power source is used to power the sinking outputs, use power

choice A, above.

Power Budgeting Example

Power Source 5VDC

power (mA)

24VDC

power (mA)

D0-06DD1

(select row

A or row B)

A1500mA 300mA

B2000mA 200mA

Current Required 5VDC

power (mA)

24VDC

power (mA)

D0-06DD1 600mA 280mA, note 1

D0-16ND3 35mA 0

D0-10TD1 150mA 0

D0-08TR 280mA 0

F0-4AD2DA-2 100mA 0

D0-06LCD 50mA 0

Total Used 1215mA 280mA

Remaining A285mA 20mA

B 785mA note 2

DL06 Power Supplied by Base Units

Part Number 5 VDC (mA) 24 VDC (mA)

D0-06xx <1500mA 300mA

<2000mA 200mA

D0-06xx-D 1500mA none

DL06 Power Consumed by Other Devices

Part Number 5 VDC (mA) 24 VDC (mA)

D0-06LCD 50mA none

D2-HPP 200mA none

DV-1000 150mA none

EA1-S3ML 210mA none

EA1-S3MLW 210mA none

DL06 Base Unit Power Required

Part Number 5 VDC (mA) 24 VDC (mA)

D0-06AA 800mA none

D0-06AR 900mA none

D0-06DA 800mA none

D0-06DD1 600mA 280mA, note 1

D0-06DD2 600mA none

D0-06DR 950mA none

D0-06DD1-D 600mA 280mA, note 1

D0-06DD2-D 600mA none

D0-06DR-D 950mA none

If the 5VDC loading is less than 2000mA, but more than

1500mA, then available 24VDC supply current is 200mA.

If the 5VDC loading is less than 1500mA, then the

available 24VDC current is 300mA.

NOTE: See the DL05/DL06 OPTIONS

manual for the module data for your project.

DL06 Power Consumed

by Option Cards

Part Number 5 VDC (mA) 24 VDC (mA)

D0-07CDR 130mA none

D0-08CDD1 100mA none

D0-08TR 280mA none

D0-10ND3 35mA none

D0-10ND3F 35mA none

D0-10TD1 150mA none

D0-10TD2 150mA none

D0-16ND3 35mA none

D0-16TD1 200mA none

D0-16TD2 200mA none

D0-DCM 250mA none

D0-DEVNETS 45mA none

F0-04TRS 250mA none

F0-08NA-1 5mA none

F0-04AD-1 50mA none

F0-04AD-2 75mA none

F0-04DAH-1 25mA 150mA

F0-04DAH-2 25mA 30mA

F0-08ADH-1 25mA 25mA

F0-08ADH-2 25mA 25mA

F0-08DAH-1 25mA 220mA

F0-08DAH-2 25mA 30mA

F0-2AD2DA-2 50mA 30mA

F0-4AD2DA-1 100mA 40mA

F0-4AD2DA-2 100mA none

F0-04RTD 70mA none

F0-04THM 30mA none

F0-CP128 150mA none

H0-CTRIO(2) 250mA none

H0-ECOM 250mA none

H0-ECOM100 300mA none

H0-PSCM 530mA none

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–7

Chapter 4: System Design and Configuration

DL06 Port Pinouts

Configuring the DL06’s Comm Ports

This section describes how to configure the CPU’s built-in networking ports for either

MODBUS or DirectNET. This will allow you to connect the DL06 PLC system directly to

MODBUS networks using the RTU protocol, or to other devices on a DirectNET network.

MODBUS masters on the network must be capable of issuing the MODBUS commands

to read or write the appropriate data. For details on the MODBUS protocol, please refer

to the Gould MODBUS Protocol reference Guide (P1–MBUS–300 Rev. B). In the event

a more recent version is available, check with your MODBUS supplier before ordering the

documentation. For more details on DirectNET, order our DirectNET manual, part number

DA–DNET–M.

NOTE: For information about the MODBUS protocol see the Group Schneider Web site at: www.

schneiderautomation.com. At the main menu, select Support/Services, Modbus, Modbus Technical Manuals,

PI-MBUS-300 Modbus Protocol Reference Guide or search for PIMBUS300. For more information about

the DirectNET protocol, order our DirectNET user manual, part number DA–DNET–M, or download it

free from our Web site: www.automationdirect.com. Select Documentation/Misc./DA-DNET-M.

Communications Port 2

Port 2

Connects to HPP, DirectSOFT 5, operator

interfaces, etc.

15-pin, multifunction port, RS232C, RS422, RS485

Communication speed (baud): 300, 600, 1200,

2400, 4800, 9600, 19200, 38400

Parity: odd (default), even, none

Station Address: 1 (default)

8 data bits

1 start, 1 stop bit

Asynchronous, half-duplex, DTE

Protocol (auto-select): K-sequence (slave only),

DirectNET (master/slave), MODBUS (master/slave),

non-sequence/print/ASCII in/out

Port 1 Pin Descriptions

10V Power (-) connection (GND)

25V Power (+) connection

3RXD Receive data (RS-232C)

4TXD Transmit data (RS-232C)

55V Power (+) connection

60V Power (-) connection (GND)

Port 2 Pin Descriptions

15V Power (+) connection

2TXD Transmit data (RS-232C)

3RXD Receive data (RS-232C)

4RTS Ready to send (RS-232C)

5CTS Clear to send (RS232C)

6RXD- Receive data (-) (RS-422/485)

70V Power (-) connection (GND)

80V Power (-) connection (GND)

9TXD+ Transmit data (+) (RS-422/485)

10 TXD- Transmit data (-) (RS-422/485)

11 RTS+ Ready to send (+) (RS-422/485)

12 RTS- Ready to send (-) (RS-422/485)

13 RXD+ Receive data (+) (RS-422/485)

14 CTS+ Clear to send (+) (RS-422/485)

15 CTS- Clear to send (-) (RS-422/485)

Communications Port 1

Port 1

Connects to HPP, DirectSOFT 5, operator

interfaces, etc.

6-pin, RS232C

Communication speed (baud): 9600 (fixed)

Parity: odd (fixed)

Station Address: 1 (fixed)

8 data bits

1 start, 1 stop bit

Asynchronous, half-duplex, DTE

Protocol (auto-select): K-sequence (slave only),

DirectNET (slave only), MODBUS (slave only)

DL06 Port Specifications

PORT1 PORT2

TERM

RUN STOP

ORT

PORT

PORT1 PORT2

3425

610

1115

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–8

Chapter 4: System Design and Configuration

RS-232 Network

Normally, the RS-232

signals are used for

shorter distances (15

meters maximum),

for communications

between two devices.

Choosing a Network Specification

The DL06 PLC’s multi-function port gives you the option of using RS-232C, RS-422, or

RS-485 specifications. First, determine whether the network will be a 2-wire RS–232C type,

a 4-wire RS–422 type, or a 2-wire/4-wire RS-485 type.

The RS–232C specification is simple to implement for networks of shorter distances (15

meters max) and where communication is only required between two devices. The RS–422

and RS-485 signals are for networks that cover longer distances (1000 meters max.) and for

multi-drop networks (from 2 to 247 devices).

NOTE: Termination resistors are required at both ends of RS–422 and RS-485 networks. It is necessary to

select resistors that match the impedance rating of the cable (between 100 and 500 ohms).

DL06 CPU Port 2

TXD+ / RXD+

TXD– / RXD–

Termination

Resistor

Signal GND

Connect shield

to signal ground

TXD+

TXD–

RXD–

RXD+

TXD+

TXD–

RXD–

RXD+

TXD+ / RXD+

TXD– / RXD–

Signal GND

TXD+ / RXD+

TXD– / RXD–

Signal GND

RTS+

RTS–

CTS+

CTS–

RTS+

RTS–

CTS+

CTS–

DL06 CPU Port 2

The recommended cable for

RS422 is AutomationDirect L19954

(Belden 9842) or equivalent.

RXD+

RXD–

TXD+

TXD–

Signal GND

PORT 2

Master

9 TXD+

10 TXD–

13 RXD+

6 RXD–

1 1 R TS+

12 R TS–

14 CTS+

15 CTS–

70 V

T ermination

Resistor at

both ends of

network

The recommended cable for RS422 is

AutomationDirect L19772 (Belden 8102)

or equivalent.

Signal GND

RXD

TXD

RXD

GND

RTS

CTS

RTS

CTS

RTS

CTS

Loop

Back

PORT1

6P6C

Phone Jack

Point-to-point

DTE Device

Signal GND

RXD RXD

TXD TXD

Connections on Port 2

Connections on Port 1

RS-422 Network

RS-422 signals are for

long distances ( 1000

meters maximum). Use

terminator resistors at both

ends of RS-422 network

wiring, matching the

impedence rating of the

cable (between 100 and

500 ohms).

RS-485 Network

RS-485 signals are for

longer distances (1000

meters max) and for

multi-drop networks.

Use termination resistors

at both ends of RS-485

network wiring, matching

the impedance rating of

the cable (between 100

and 500 ohms).

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–9

Chapter 4: System Design and Configuration

Connecting to MODBUS and DirectNET Networks

MODBUS Port Configuration

In DirectSOFT 5, choose the PLC menu, then Setup, then “Secondary Comm Port”.

• Port: From the port number list box at the top, choose “Port 2”.

• Protocol: Check the box to the left of “MODBUS” (use AUX 56 on the HPP, and select

“MBUS”), and then you’ll see the box below.

• Timeout: amount of time the port will wait after it sends a message to get a response before logging

an error.

• RTS ON / OFF Delay Time: The RTS ON Delay Time specifies the time the DL06 waits to send

the data after it has raised the RTS signal line. The RTS OFF Delay Time specifies the time the

DL06 waits to release the RTS signal line after the data has been sent. When using the DL06 on a

multi-drop network, the RTS ON Delay time must be set to 5ms or more and the RTS OFF Delay time

must be set to 2ms or more. If you encounter problems, the time can be increased.

• Station Number: For making the CPU port a MODBUS master, choose “1”. The possible range

for MODBUS slave numbers is from 1 to 247, but the DL06 network instructions used in Master

mode will access only slaves 1 to 99. Each slave must have a unique number. At powerup, the port

is automatically a slave, unless and until the DL06 executes ladder logic network instructions which

use the port as a master. Thereafter, the port reverts back to slave mode until ladder logic uses the

port again.

• Baud Rate: The available baud rates include 300, 600, 1200, 2400, 4800, 9600, 19200, and 38400

baud. Choose a higher baud rate initially, reverting to lower baud rates if you experience data errors

or noise problems on the network. Important: You must configure the baud rates of all devices on

the network to the same value. Refer to the appropriate product manual for details.

• Stop Bits: Choose 1 or 2 stop bits for use in the protocol.

• Parity: Choose none, even, or odd parity for error checking.

•Echo Suppression: Select the appropriate wiring configuration used on Port 2.

Then click the button indicated to send the Port configuration to the CPU, and click

Close.

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–10

Chapter 4: System Design and Configuration

DirectNET Port Configuration

In DirectSOFT 5, choose the PLC menu, then Setup, then “Secondary Comm Port”.

• Port: From the port number list box, choose “Port 2 ”.

• Protocol: Check the box to the left of “DirectNET” (use AUX 56 on the HPP, then select

“DNET”), and then you’ll see the dialog below.

• Timeout: Amount of time the port will wait after it sends a message to get a response before logging

an error.

• RTS ON / OFF Delay Time: The RTS ON Delay Time specifies the time the DL06 waits to send

the data after it has raised the RTS signal line. The RTS OFF Delay Time specifies the time the

DL06 waits to release the RTS signal line after the data has been sent. When using the DL06 on a

multi-drop network, the RTS ON Delay time must be set to 5ms or more and the RTS OFF Delay time

must be set to 2ms or more. If you encounter problems, the time can be increased.

• Station Number: For making the CPU port a DirectNET master, choose “1”. The allowable range

for DirectNET slaves is from 1 to 90 (each slave must have a unique number). At powerup, the port

is automatically a slave, unless and until the DL06 executes ladder logic instructions which attempt

to use the port as a master. Thereafter, the port reverts back to slave mode until ladder logic uses the

port again.

• Baud Rate: The available baud rates include 300, 600, 1200, 2400, 4800, 9600, 19200, and 38400

baud. Choose a higher baud rate initially, reverting to lower baud rates if you experience data errors

or noise problems on the network. Important: You must configure the baud rates of all devices on

the network to the same value.

• Stop Bits: Choose 1 or 2 stop bits for use in the protocol.

• Parity: Choose none, even, or odd parity for error checking.

• Format: Choose between hex or ASCII formats.

Then click the button indicated to send the Port configuration to the CPU, and click

Close.

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–11

Chapter 4: System Design and Configuration

Non–Sequence Protocol (ASCII In/Out and PRINT)

Non-Sequence Port Configuration

Configuring port 2 on the DL06 for Non–Sequence allows the CPU to use port 2 to

either read or write raw ASCII strings using the ASCII instructions. See the ASCII In/Out

instructions and the PRINT instruction in chapter 5.

In DirectSOFT 5, choose the PLC menu, then Setup, then “Secondary Comm Port”.

• Port: From the port number list box at the top, choose “Port 2”.

• Protocol: Check the box to the left of “Non–Sequence”.

• Timeout: Amount of time the port will wait after it sends a

message to get a response before logging an error.

• RTS On Delay Time: The amount of time between raising

the RTS line and sending the data.

• RTS Off Delay Time: The amount of time between resetting

the RTS line after sending the data.

• Data Bits: Select either 7–bits or 8–bits to match the number

of data bits specified for the connected devices.

• Baud Rate: The available baud rates include 300,

600, 900, 2400, 4800, 9600, 19200, and 38400

baud. Choose a higher baud rate initially, reverting to

lower baud rates if you experience data errors or noise

problems on the network. Important: You must configure the

baud rates of all devices on the network to the same value.

Refer to the appropriate product manual for details.

• Stop Bits: Choose 1 or 2 stop bits to match the number of stop bits specified for the connected

devices.

• Parity: Choose none, even, or odd parity for error checking. Be sure to match the parity specified

for the connected devices.

• Echo Suppression: Select the appropriate radio button based on the wiring configuration used on

port 2.

• Xon/Xoff Flow Control: Choose this selection if you have Port 2 wired for Hardware Flow Control

(Xon/Xoff) with RTS and CTS signal connected between all devices.

• RTS Flow Control: Choose this selection if you have Port 2 RTS signal wired between all devices.

Click the button indicated to send the port configuration to the CPU, and click Close.

• Memory Address: Please choose a memory address with 64 words of contiguous free memory for

use by Non-Sequence Protocol.

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–12

Chapter 4: System Design and Configuration

Network Slave Operation

This section describes how other devices on a network can communicate with a CPU port

that you have configured as a DirectNET slave or MODBUS slave (DL06). A MODBUS

host must use the MODBUS RTU protocol to communicate with the DL06 as a slave. The

host software must send a MODBUS function code and MODBUS address to specify a PLC

memory location the DL06 comprehends. The DirectNET host uses normal I/O addresses to

access applicable DL06 CPU and system. No CPU ladder logic is required to support either

MODBUS slave or DirectNET slave operation.

NOTE: For more intformation on DirectNET proprietary protocol, see the DirectNET reference

manual, DA-DNET-M, available on our website.

MODBUS Function Codes Supported

The MODBUS function code determines whether the access is a read or a write, and whether

to access a single data point or a group of them. The DL06 supports the MODBUS function

codes described below.

Determining the MODBUS Address

There are typically two ways that most host software conventions allow you to specify a PLC

memory location. These are:

• By specifying the MODBUS data type and address

• By specifying a MODBUS address only

MODBUS Function Code Function DL06 Data Types Available

01 Read a group of coils Y, CR, T, CT

02 Read a group of inputs X, SP

05 Set / Reset a single coil Y, CR, T, CT

15 Set / Reset a group of coils Y, CR, T, CT

03, 04 Read a value from one or more registers V

06 Write a value into a single register V

16 Write a value into a group of registers V

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–13

Chapter 4: System Design and Configuration

If Your Host Software Requires the Data Type and Address

Many host software packages allow you to specify the MODBUS data type and the

MODBUS address that corresponds to the PLC memory location. This is the easiest method,

but not all packages allow you to do it this way.

The actual equation used to calculate the address depends on the type of PLC data you are

using. The PLC memory types are split into two categories for this purpose.

• Discrete – X, SP, Y, CR, S, T, C (contacts)

• Word – V, Timer current value, Counter current value

In either case, you basically convert the PLC octal address to decimal and add the appropriate

MODBUS address (if required). The table below shows the exact equation used for each

group of data.

DL06 Memory Type QTY

(Decimal)

PLC Range

(Octal)

MODBUS Address

Range

(Decimal)

MODBUS Data Type

For Discrete Data Types .... Convert PLC Addr. to Dec. + Start of Range + Data Type

Inputs (X) 512 X0 – X777 2048 – 2559 Input

Special Relays(SP) 512 SP0 – SP777 3072 – 3583 Input

Outputs (Y) 512 Y0 – Y777 2048 – 2559 Coil

Control Relays (CR) 1024 C0 – C1777 3072 – 4095 Coil

Timer Contacts (T) 256 T0 – T377 6144 – 6399 Coil

Counter Contacts (CT) 128 CT0 – CT177 6400 – 6527 Coil

Stage Status Bits(S) 1024 S0 – S1777 5120 – 6143 Coil

For Word Data Types .... Convert PLC Addr. to Dec. + Data Type

Timer Current Values (V) 256 V0 – V377 0 – 255 Input Register

Counter Current Values (V) 128 V1000 – V1177 512 – 639 Input Register

V-Memory, user data (V) 3200 V1200 – V7377 640 – 3839 Holding Register

4096 V10000 - V17777 4096 - 8191 Holding Register

V-Memory, non-volatile (V) 128 V7400 – V7577 3840 – 3967 Holding Register

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–14

Chapter 4: System Design and Configuration

The following examples show how to generate the MODBUS address and data type for hosts

which require this format.

Example 1: V2100

Find the MODBUS address for User V location V2100.

1. Find V-memory in the table.

2. Convert V2100 into decimal (1088).

3. Use the MODBUS data type from the table.

Example 2: Y20

Find the MODBUS address for output Y20.

1. Find Y outputs in the table.

2. Convert Y20 into decimal (16).

3. Add the starting address for the range (2048).

4. Use the MODBUS data type from the table.

Example 3: T10 Current Value

Find the MODBUS address to obtain the current value from Timer T10.

1. Find Timer Current Values in the table.

2. Convert T10 into decimal (8).

3. Use the MODBUS data type from the table.

Example 4: C54

Find the MODBUS address for Control Relay C54.

1. Find Control Relays in the table.

2. Convert C54 into decimal (44).

3. Add the starting address for the range (3072).

4. Use the MODBUS data type from the table.

V-memory, user data (V) 3200 V1200 – V7377 640 – 3839 Holding Register

Control Relays (CR) 512 C0 – C77 3072 – 3583 Coil

Outputs (V) 256 Y0 – Y377 2048 - 2303 Coil

Timer Current Values (V) 128 V0 – V177 0 - 127 Input Register

Coil 2064

Coil 3116

Holding Reg 1088

Input Reg. 8

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–15

Chapter 4: System Design and Configuration

If Your MODBUS Host Software Requires an Address ONLY

Some host software does not allow you to specify the MODBUS data type and address.

Instead, you specify an address only. This method requires another step to determine the

address, but it’s still fairly simple. Basically, MODBUS also separates the data types by

address ranges as well. So this means an address alone can actually describe the type of

data and location. This is often referred to as “adding the offset”. One important thing to

remember here is that two different addressing modes may be available in your host software

package. These are:

• 484 Mode

• 584/984 Mode

We recommend that you use the 584/984 addressing mode if your host software allows

you to choose. This is because the 584/984 mode allows access to a higher number of

memory locations within each data type. If your software only supports 484 mode, then there

may be some PLC memory locations that will be unavailable. The actual equation used to

calculate the address depends on the type of PLC data you are using. The PLC memory types

are split into two categories for this purpose.

• Discrete – X, SP, Y, CR, S, T (contacts), C (contacts)

• Word – V, Timer current value, Counter current value

In either case, you basically convert the PLC octal address to decimal and add the appropriate

MODBUS addresses (as required). The table below shows the exact equation used for each

group of data.

Discrete Data Types

DL06 Memory Type PLC Range

(Octal)

Address (484

Mode)

Address (584/984

Mode)

MODBUS Data

Type

Global Inputs (GX) GX0-GX1746 1001 - 1999 10001 - 10999 Input

GX1747-GX3777 --- 11000 - 12048 Input

Inputs (X) X0 – X1777 --- 12049 - 13072 Input

Special Relays (SP) SP0 – SP777 --- 13073 - 13584 Input

Global Outputs (GY) GY0 - GY3777 1 - 2048 1 - 2048 Output

Outputs (Y) Y0 – Y1777 2049 - 3072 2049 - 3072 Output

Control Relays (CR) C0 – C3777 3073 - 5120 3073 - 5120 Output

Timer Contacts (T) T0 – T377 6145 - 6400 6145 - 6400 Output

Counter Contacts (CT) CT0 – CT377 6401 - 6656 6401 - 6656 Output

Stage Status Bits (S) S0 – S1777 5121 - 6144 5121 - 6144 Output

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–16

Chapter 4: System Design and Configuration

Example 1: V2100 584/984 Mode

Find the MODBUS address for User V location V2100. PLC Address (Dec.) + Mode Address

1. Find V-memory in the table. V2100 = 1088 decimal

2. Convert V2100 into decimal (1088). 1088 + 40001 =

3. Add the MODBUS starting address for the

mode (40001).

Example 2: Y20 584/984 Mode

Find the MODBUS address for output Y20. PLC Addr. (Dec.) + Start Address + Mode

1. Find Y outputs in the table. Y20 = 16 decimal

2. Convert Y20 into decimal (16). 16 + 2048 + 1 =

3. Add the starting address for the range (2048).

4. Add the MODBUS address for the mode (1).

Word Data Types

Registers PLC Range

(Octal)

Input/Holding

(484 Mode)*

Input/Holding

(584/984 Mode)*

V-memory (Timers) V0 - V377 3001/4001 30001/40001

V-memory (Counters) V1000 - V1177 3513/4513 30513/40513

V-memory (Data Words)

V1200 - V1377 3641/4641 30641/40641

V1400 - V1746 3769/4769 30769/40769

V1747 - V1777 --- 31000/41000

V2000 - V7377 --- 41025

V10000 - V17777 --- 44097

1. Refer to your PLC user manual for the correct memory mapping size of your PLC. Some of

the addresses shown above might not pertain to your particular CPU.

2. For an automated MODBUS/Koyo address conversion utility, go to our

website, www.automationdirect.com, and down load download the EXCEL file

modbus_conversion.xls located at: Tech Support > Technical Support Home page.

41089

For Word Data Types.... PLC Address (Dec.) + Appropriate Mode Address

Timer Current Values (V) 128 V0 – V177 0 – 127 3001 30001 Input Register

Counter Current Values (V) 128 V1200 – V7377 640 – 3839 3001 30001 Input Register

V-memory, user data (V) 1024 V2000 – V3777 1024 – 2047 4001 40001 Holding Register

2065

Outputs (Y) 320 Y0 - Y477 2048 – 2367 1 1 Coil

Control Relays (CR) 256 C0 - C377 3072 – 3551 1 1 Coil

Timer Contacts (T) 128 T0 - T177 6144 – 6271 1 1 Coil

*MODBUS: Function 04

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–17

Chapter 4: System Design and Configuration

Example 3: T10 Current Value 484 Mode

Find the MODBUS address to obtain the PLC Address (Dec.) + Mode Address

current value from Timer T10. TA10 = 8 decimal

1. Find Timer Current Values in the table. 8 + 3001

2. Convert T10 into decimal (8).

3. Add the MODBUS starting address for the mode (3001).

Example 4: C54 584/984 Mode

Find the MODBUS address for Control Relay C54. PLC Addr. (Dec.) + Start Address + Mode

1. Find Control Relays in the table. C54 = 44 decimal

2. Convert C54 into decimal (44). 44 + 3072 + 1

3. Add the starting address for the range (3072).

4. Add the MODBUS address for the mode (1).

Network Master Operation

This section describes how the DL06 can communicate on a MODBUS or DirectNET

network as a master. For MODBUS networks, it uses the MODBUS RTU protocol, which

must be interpreted by all the slaves on the network. Both MODBUS and DirectNet are

single master/multiple slave networks. The master is the only member of the network that can

initiate requests on the network. This section teaches you how to design the required ladder

logic for network master operation.

For Word Data Types.... PLC Address (Dec.) + Appropriate Mode Address

Timer Current Values (V) 128 V0 – V177 0 – 127 3001 30001 Input Register

Counter Current Values (V) 128 V1200 – V7377 512 – 639 3001 30001 Input Register

V-memory, user data (V) 1024 V2000 – V3777 1024 – 2047 4001 40001 Holding Register

Outputs (Y) 320 Y0 – Y477 2048 – 2367 1 1 Coil

Control Relays (CR) 256 C0 – C377 3072 – 3551 1 1 Coil

Timer Contacts (T) 128 T0– T177 6144 – 6271 1 1 Coil

3009

3117

Slave #1 Slave #3

Master M

RTU Protocol, or DirectNET

Slave #2

LOGIC

Koyo

C0 C4C2X1 X3 X4 X6 X11X13 X14X16 X21X23 N.C.

C1 C3X2 X5 X7 X10X12 X15 X17X20 X22X0 N.C.

AC(N)24V

N.C.

C1 C3Y0 Y15Y12Y10Y17Y7Y5Y2

C0 C2 Y16Y14Y13Y11Y6Y4Y3Y1

LGG

AC(L)

D0-06DR

2.0AOUTPUT: 6-240V 50 - 60Hz 2.0A,6 - 27V

INPUT: 12 - 24V 3 - 15mA

40VA50-60HzPWR: 100-240V

01 2345 6710 11 12 13 14 15 16 17 20 21 22 23

PORT1PORT2

TERM

RUNSTOP

PWR

RUN

CPU

TX1

RX1

TX2

RX2

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–18

Chapter 4: System Design and Configuration

When using the DL06 PLC as the master station, simple RLL instructions are used to initiate

the requests. The WX instruction initiates network write operations, and the RX instruction

initiates network read operations. Before executing either the WX or RX commands, we will

need to load data related to the read or write operation onto the CPU’s accumulator stack.

When the WX or RX instruction executes, it uses the information on the stack combined with

data in the instruction box to completely define the task, which goes to the port.

The following step-by-step procedure will provide you the information necessary to set up

your ladder program to receive data from a network slave.

Slave

Master

(write)

RX (read)

Network

LOGIC

Koyo

C0 C4C2X1 X3 X4 X6 X11X13 X14X16 X21X23 N.C.

C1 C3X2 X5 X7 X10X12 X15 X17X20 X22X0 N.C.

AC(N)24V

N.C.

C1 C3Y0 Y15Y12Y10Y17Y7Y5Y2

C0 C2 Y16Y14Y13Y11Y6Y4Y3Y1

AC(L)

D0-06DR

2.0AOUTPUT: 6-240V 50 - 60Hz 2.0A, 6 - 27V

INPUT: 12 - 24V3 - 15mA

40VA50-60HzPWR: 100-240V

01 2345 6710 11 12 13 14 15 16 17 20 21 22 23

PORT1 PORT2

TERM

RUN STOP

PWR

RUN

CPU

TX1

RX1

TX2

RX2

2 0 1F

Internal port (hex)

Port number (BCD)

Slave address (BCD)

KF201

6 4 (BCD)

# of bytes to transfer

K64

Step 2: Load Number of Bytes to Transfer

The second Load (LD) instruction determines

the number of bytes which will be transferred

between the master and slave in the subsequent

WX or RX instruction. The value to be loaded

is in BCD format (decimal), from 1 to 128

bytes.

Step 1: Identify Master Port # and Slave #

The first Load (LD) instruction identifies the

communications port number on the network

master (DL06) and the address of the slave

station. This instruction can address up to 99

MODBUS slaves, or 90 DirectNET slaves.

The format of the word is shown to the right.

The “F2” in the upper byte indicates the use of

the right port of the DL06 PLC, port number

2. The lower byte contains the slave address

number in BCD (01 to 99).

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–19

Chapter 4: System Design and Configuration

DL05 / 06 / 205 / 350 / 405 Memory Bits per unit Bytes

V-memory

T / C current value

Inputs (X, SP) 8 1

Outputs

(Y, C, Stage, T/C bits) 8 1

Scratch Pad Memory 8 1

Diagnostic Status 8 1

DL330 / 340 Memory Bits per unit Bytes

Data registers

T / C accumulator

I/O, internal relays, shift register bits, T/C

bits, stage bits 1 1

Scratch Pad Memory 8 1

Diagnostic Status(5 word R/W) 16 10

The number of bytes specified also depends on the type of data you want to obtain. For

example, the DL06 Input points can be accessed by V-memory locations or as X input

locations. However, if you only want X0 – X27, you’ll have to use the X input data type

because the V-memory locations can only be accessed in 2-byte increments. The following

table shows the byte ranges for the various types of DirectLOGIC products.

NOTE: Since V-memory words are always 16 bits, you may not always use the whole word. For example,

if you only specify 3 bytes and you are reading Y outputs from the slave, you will only get 24 bits of data. In

this case, only the 8 least significant bits of the last word location will be modified. The remaining 8 bits are

not affected.

6 0 00

(octal)

LDA

O40600

Starting address of

master transfer area

V40600

MSB LSB

V40601

MSB LSB

015

Step 3: Specify Master Memory Area

The third instruction in the RX or WX sequence

is a Load Address (LDA) instruction. Its purpose

is to load the starting address of the memory area

to be transferred. Entered as an octal number, the

LDA instruction converts it to hex and places the

result in the accumulator.

For a WX instruction, the DL06 CPU sends

the number of bytes previously specified from

its memory area beginning at the LDA address

specified.

For an RX instruction, the DL06 CPU reads the

number of bytes previously specified from the

slave, placing the received data into its memory

area beginning at the LDA address specified.

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–20

Chapter 4: System Design and Configuration

DL305 Series CPU Memory Type–to–MODBUS Cross Reference (excluding 350 CPU)

PLC Memory Type PLC Base

Address

MODBUS

Base Address

PLC Memory

Type

PLC Base

Address

MODBUS

Base Address

TMR/CNT Current Values R600 V0 TMR/CNT Status

Bits CT600 GY600

I/O Points IO 000 GY0 Control Relays CR160 GY160

Data Registers R401,R400 V100 Shift Registers SR400 GY400

Stage Status Bits (D3-330P only) S0 GY200

KF201

K64

LDA

O40600

SP116

Step 4: Specify Slave Memory Area

The last instruction in our sequence is the WX or RX

instruction itself. Use WX to write to the slave, and

RX to read from the slave. All four of our instructions

are shown to the right. In the last instruction, you

must specify the starting address and a valid data type

for the slave.

• DirectNET slaves – specify the same address in the WX

and RX instruction as the slave’s native I/O address

• MODBUS DL405, DL205, or DL06 slaves – specify

the same address in the WX and RX instruction as the

slave’s native I/O address

• MODBUS 305 slaves – use the following table to

convert DL305 addresses to MODBUS addresses

K101

K4128

LDA

O4000

The Maximum constant possible is 4128. This

is due to the 128 maximum number of Bytes

that the RX/WX instruction can allow. The

value of 4 in the most significant position of

the word will cause the RX to use function 04

(30001 range).

The DL05/06, DL250-1/260, DL350 and DL450 will support function 04, read input

position (4xxx). Four digits must be entered for the intruction to work properly with this

mode.

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–21

Chapter 4: System Design and Configuration

Port Communication Error

KF201

K0003

LDA

O40600

SP116

Port Busy

SP117

SET

Interlocking Relay

KF201

K0003

LDA

O40600

VY0

SP116

SET

C100

KF201

K0003

LDA

O40400

VY0

SP116

RST

C100

Interlocking

Relay

Multiple Read and Write Interlocks

If you are using multiple reads and writes

in the RLL program, you have to interlock

the routines to make sure all the routines are

executed. If you don’t use the interlocks, then

the CPU will only execute the first routine.

This is because each port can only handle one

transaction at a time.

In the example to the right, after the RX

instruction is executed, C100 is set. When the

port has finished the communication task, the

second routine is executed and C100 is reset.

If you’re using RLLPLUS Stage Programming,

you can put each routine in a separate program

stage to ensure proper execution and switch

from stage to stage allowing only one of them

to be active at a time.

Communications from a Ladder Program

Typically network communications will last

longer than 1 scan. The program must wait

for the communications to finish before

starting the next transaction.

Port 2, which can be a master, has two

Special Relay contacts associated with it (see

Appendix D for comm port special relays).

One indicates “Port busy”(SP116), and

the other indicates ”Port Communication

Error”(SP117). The example above shows the

use of these contacts for a network master that

only reads a device (RX). The “Port Busy”

bit is on while the PLC communicates with

the slave. When the bit is off the program can

initiate the next network request.

The “Port Communication Error” bit turns

on when the PLC has detected an error. Use

of this bit is optional. When used, it should

be ahead of any network instruction boxes

since the error bit is reset when an RX or WX

instruction is executed

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–22

Chapter 4: System Design and Configuration

Network Master Operation (using MRX and MWX

Instructions)

This section describes how the DL06 can communicate on a MODBUS RTU network as a

master using the MRX and MWX read/write instructions. These instructions allow you to

enter native MODBUS addressing in your ladder logic program with no need to perform

octal to decimal conversions. MODBUS is a single master/multiple slave network. The

master is the only member of the network that can initiate requests on the network. This

section teaches you how to design the required ladder logic for network master operation.

MODBUS Function Codes Supported

The MODBUS function code determines whether the access is a read or a write, and whether

to access a single data point or a group of them. The DL06 supports the MODBUS function

codes described below.

MODBUS Function Code Function DL06 Data Types Available

01 Read a group of coils Y, CR, T, CT

02 Read a group of inputs X, SP

05 Set / Reset a single coil (slave only) Y, CR, T, CT

15 Set / Reset a group of coils Y, CR, T, CT

03, 04 Read a value from one or more registers V

06 Write a value into a single register (slave only) V

07 Read Exception Status V

08 Diagnostics V

16 Write a value into a group of registers V

Slave #1 Slave #3

Master M

RTU Protocol, or DirectNET

Slave #2

LOGIC

Koyo

C0 C4C2X1 X3 X4 X6 X11X13 X14X16 X21X23 N.C.

C1 C3X2 X5 X7 X10X12 X15 X17X20 X22X0 N.C.

AC(N)24V

N.C.

C1 C3Y0 Y15Y12Y10Y17Y7Y5Y2

C0 C2 Y16Y14Y13Y11Y6Y4Y3Y1

LGG

AC(L)

D0-06DR

2.0AOUTPUT: 6-240V 50 - 60Hz 2.0A,6 - 27V

INPUT: 12 - 24V 3 - 15mA

40VA50-60HzPWR: 100-240V

01 2345 6710 11 12 13 14 15 16 17 20 21 22 23

PORT1PORT2

TERM

RUNSTOP

PWR

RUN

CPU

TX1

RX1

TX2

RX2

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–23

Chapter 4: System Design and Configuration

MODBUS Read from Network(MRX)

The MODBUS Read from Network (MRX) instruction is used by the DL06 network master

to read a block of data from a connected slave device and to write the data into V–memory

addresses within the master. The instruction allows the user the to specify the MODBUS

Function Code, slave station address, starting master and slave memory addresses, number of

elements to transfer, MODBUS data format and the Exception Response Buffer.

• Port Number: must be DL06 Port 2 (K2)

• Slave Address: specify a slave station address (0–247)

• Function Code: The following MODBUS function codes are supported by the MRX

instruction:

01 – Read a group of coils

02 – Read a group of inputs

03 – Read holding registers

04 – Read input registers

07 – Read Exception status

08 – Diagnostics

• Start Slave Memory Address: specifies the starting slave memory address of the data to be

read. See the table on the following page.

• Start Master Memory Address: specifies the starting memory address in the master where

the data will be placed. See the table on the following page.

• Number of Elements: specifies how many coils, input, holding registers or input register

will be read. See the table on the following page.

• MODBUS Data Format: specifies MODBUS 584/984 or 484 data format to be used

• Exception Response Buffer: specifies the master memory address where the Exception

Response will be placed. See the table on the following page.

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–24

Chapter 4: System Design and Configuration

MRX Slave Memory Address

MRX Master Memory Addresses

MRX Number of Elements

MRX Exception Response Buffer

MRX Slave Address Ranges

Function Code MODBUS Data Format Slave Address Range(s)

01 – Read Coil 484 Mode 1–999

01 – Read Coil 584/984 Mode 1–65535

02 – Read Input Status 484 Mode 1001–1999

02 – Read Input Status 584/984 Mode 10001–19999 (5 digit) or 100001–165535

(6 digit)

03 – Read Holding Register 484 Mode 4001–4999

03 – Read Holding Register 584/984 40001–49999 (5 digit) or 4000001–465535

(6 digit)

04 – Read Input Register 484 Mode 3001–3999

04 – Read Input Register 584/984 Mode 30001–39999 (5 digit) or 3000001–365535

(6 digit)

07 – Read Exception Status 484 and 584/984 Mode n/a

08 – Diagnostics 484 and 584/984 Mode 0–65535

MRX Master Memory Address Ranges

Operand Data Type DL06 Range

Inputs X 0–1777

Outputs Y 0–1777

Control Relays C 0–3777

Stage Bits S 0–1777

Timer Bits T 0–377

Counter Bits CT 0–377

Special Relays SP 0–777

V–memory V All

Global Inputs GX 0–3777

Global Outputs GY 0–3777

MRX Number of Elements

Operand Data Type DL06 Range

V–memory V All

Constant K 1–2000

MRX Exception Response Buffer

Operand Data Type DL06 Range

V–memory V All

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–25

Chapter 4: System Design and Configuration

MODBUS Write to Network (MWX)

The MODBUS Write to Network (MWX) instruction is used to write a block of data from

the network masters’s (DL06) memory to MODBUS memory addresses within a slave device

on the network. The instruction allows the user to specify the MODBUS Function Code,

slave station address, starting master and slave memory addresses, number of elements to

transfer, MODBUS data format and the Exception Response Buffer.

• Port Number: must be DL06 Port 2 (K2)

• Slave Address: specify a slave station address (0–247)

• Function Code: The following MODBUS function codes are supported by the MWX

instruction:

05 – Force Single coil

06 – Preset Single Register

08 – Diagnostics

15 – Force Multiple Coils

16 – Preset Multiple Registers

• Start Slave Memory Address: specifies the starting slave memory address where the data

will be written.

• Start Master Memory Address: specifies the starting address of the data in the master that is

to written to the slave.

• Number of Elements: specifies how many consecutive coils or registers will be written to.

This field is only active when either function code 15 or 16 is selected.

• MODBUS Data Format: specifies MODBUS 584/984 or 484 data format to be used.

• Exception Response Buffer: specifies the master memory address where the Exception

Response will be placed.

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–26

Chapter 4: System Design and Configuration

MWX Slave Memory Address

MWX Master Memory Addresses

MWX Number of Elements

MWX Exception Response Buffer

Chapter 4: System Design and Configuration

MWX Slave Address Ranges

Function Code MODBUS Data Format Slave Address Range(s)

05 – Force Single Coil 484 Mode 1–999

05 – Force Single Coil 584/984 Mode 1–65535

06 – Preset Single Register 484 Mode 4001–4999

06 – Preset Single Register 84/984 Mode 40001–49999 (5 digit) or 400001–

465535 (6 digit)

08 – Diagnostics 484 and 584/984 Mode 0–65535

15 – Force Multiple Coils 484 1–999

15 – Force Multiple Coils 585/984 Mode 1–65535

16 – Preset Multiple Registers 484 Mode 4001–4999

16 – Preset Multiple Registers 584/984 Mode 40001–49999 (5 digit) or 4000001–

465535 (6 digit)

MWX Number of Elements

Operand Data Type DL06 Range

V–memory V All

Constant K 1–2000

MWX Exception Response Buffer

Operand Data Type DL06 Range

V–memory V All

MWX Master Memory Address Ranges

Operand Data Type DL06 Range

Inputs X 0–777

Outputs Y 0–777

Control Relays C 0–1777

Stage Bits S 0–1777

Timer Bits T 0–377

Counter Bits CT 0–177

Special Relays SP 0–777

V–memory V All

Global Inputs GX 0–3777

Global Outputs GY 0–3777

DL06 Micro PLC User Manual; 3rd Edition Rev. D 4–27

Chapter 4: System Design and Configuration

MRX/MWX Example in DirectSOFT 5

DL06 port 2 has two Special Relay contacts associated with it (see Appendix D for comm

port special relays). One indicates “Port busy”(SP116), and the other indicates ”Port

Communication Error”(SP117). The “Port Busy” bit is on while the PLC communicates

with the slave. When the bit is off the program can initiate the next network request. The

“Port Communication Error” bit turns on when the PLC has detected an error and use

of this bit is optional. When used, it should be ahead of any network instruction boxes

since the error bit is reset when an MRX or MWX instruction is executed. Typically

network communications will last longer than 1 CPU scan. The program must wait for the

communications to finish before starting the next transaction.

The “Port Communication Error” bit turns on when the PLC has detected an error. Use of

this bit is optional. When used, it should be ahead of any network instruction boxes since the

error bit is reset when an RX or WX instruction is executed.

Multiple Read and Write Interlocks

If you are using multiple reads and writes in the RLL program, you have to interlock the

routines to make sure all the routines are executed. If you don’t use the interlocks, then

the CPU will only execute the first routine. This is because each port can only handle one

transaction at a time. In the example below, after the MRX instruction is executed, C100

is set. When the port has finished the communication task, the second routine is executed

and C100 is reset. If you’re using RLLplus Stage Programming, you can put each routine in

a separate program stage to ensure proper execution and switch from stage to stage allowing

only one of them to be active at a time.

See example on the next page.

DL06 Micro PLC User Manual; 3rd Edition Rev. D

4–28

Chapter 4: System Design and Configuration

SP116 C100

Port Number: K2

Slave Address: K1

Function Code: 06 - Preset Single Register

Start Slave Memory Address: 40001

Number of Elements: n/a

Modbus Data Type: 584/984 Mode

Exception Response Buffer: V400

Instruction interlock bit

C100

( SET )

( RST )

C100

Instruction interlock bit

MRX

Port Number: K2

Slave Address: K1

Function Code: 01 - Read Coil Status

Start Slave Memory Address: 1

Start Master Memory Address: C0

Number of Elements: 32

Modbus Data Type: 584/984 Mode

Exception Response Buffer: V400

This rung does a MODBUS write to the first holding register 40001 of slave address number one.

It writes the values over that reside in V2000. This particular function code only writes to one

(WX, RX, MWX, MRX) can be enabled in one scan. That is the reason for the interlock bits. For using

many network instructions on the same port, use the Shift Register instruction.

This rung does a MODBUS read from the first 32 coils of slave address number one.

It will place the values into 32 bits of the master starting at C0.

MWX

Port 2 busy bit

SP116

Port 2 error bit

SP117

Pulse/Minute

C20

CT1

K9999

CNT

Number of errors

per minute

CT2

K9999

SP116 pulses on every transaction - CT1 counts the transactions per minute.

The counter is reset every minute.

SP117 pulses on every transaction - CT2 counts the errors per minute.

The counter is reset every minute.

CNT

Number of

transactions per

minute

_1Minute

SP3 C20

( PD )

C20

Calculation of communication transfer quantity per minute between PLC and device.

CTA1

V3600

OUT

CTA2

V3601

OUT

Transactions/Min

Errors/Minute

Pulse/Minute

C20

Pulse/Minute

Chapter 4 Ch4

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