1

In the Devices tree, double-click Generic_Modbus_TCP_Slave.

Result: The configuration window is displayed.

2

Enter a Slave IP Address value (by default 192.168.0.1).

3

Enter a Health Timeout (ms) value (by default 1000).

This represents the delay (in ms) between a request of the Modbus TCP IOScanner and a response from the slave. When the health timeout expires, the associated health bit values change to 0. Health bit values can be visualized in the IOScanner I/O Mapping tab.

1

Click the IO Scanner Channel Configuration tab:

2

To remove a channel, select it and click Delete.

3

To change the parameters of a channel, select the channel and click Edit.

4

To add a channel, click Add Channel.

This dialog box is displayed:

5

In the Channel area, you can define:

oName: optional string for naming the channel

oUnit-ID [1..255]: unit ID of the Modbus TCP slave device (by default 255). See note.

oRepetition Rate: polling interval of the Modbus request (by default 20 ms)

oComment: optional field to describe the channel

oFunction Code: type of Modbus request:

oRead/Write Multiple Registers (Function code 23) (by default)

oRead Holding Registers (Function code 03)

oWrite Multiple Registers (Function code 16)

In the READ register area, you can define:

oOffset: starting register number to read from 0 to 65535

oLength: number of the registers to be read (depending on the function code).

oError Handling: define the fallback value in the case of a communication interruption:

oKeep Last Value (by default) holds the last valid value

oSetToZero resets all values to 0

In the WRITE register area, you can define:

oOffset: starting register number to write from 0 to 65535

oLength: number of the registers to be written (depending on the function code).

6

Click OK to validate the configuration of the channel.

7

Repeat steps 4 to 6 to create other channels that define the Modbus communication with the device. For each Modbus request, you must create a channel.