Configuring a Modbus TCP IOScanner

Prerequisites

Before configuring the Modbus TCP IOScanner:

oSet the IP address of the Ethernet 2 to fixed mode. It must be different from 0.0.0.0.

oThe connected devices must be in the same subnet as the Ethernet 2 port

For more information on IP address, refer to Ethernet Configuration.

Add a Modbus TCP IOScanner

The Modbus TCP IOScanner node is automatically added when a slave is added on the Ethernet 2 node.

Configure a Modbus TCP IOScanner

Step	Action
1	In the Devices tree, double-click Modbus_TCP_IOScanner. Result: The configuration window is displayed.
2	Select the IOScanner I/O Mapping tab.
3	Select the Bus cycle task in the list: oUse parent bus cycle setting (by default), oMAST, or oAn existing task of the project. NOTE: The Bus cycle task parameter inside the I/O mapping editor of the device that contains the Modbus TCP IOScanner defines the task responsible for the refresh of the I/O images (%QW, %IW). These I/O images correspond to the Modbus request sent to the Modbus slaves and the health bits.

Step

Action

In the Devices tree, double-click Modbus_TCP_IOScanner.

Result: The configuration window is displayed.

Select the IOScanner I/O Mapping tab.

Select the Bus cycle task in the list:

oUse parent bus cycle setting (by default),

oMAST, or

oAn existing task of the project.

NOTE: The Bus cycle task parameter inside the I/O mapping editor of the device that contains the Modbus TCP IOScanner defines the task responsible for the refresh of the I/O images (%QW, %IW). These I/O images correspond to the Modbus request sent to the Modbus slaves and the health bits.

NOTE: When the Modbus TCP IOScanner is configured, the post configuration file for the Ethernet 2 network is ignored.