The Modbus slave from the FAQ Modbus Communikation Master/Slave via Ethernet is used here.
- Create a "Standard project" and select CODESYS Control Win V3 as the device.
- Define the target system by means of the Network scan.
Insert an Ethernet adapter in the device tree and specify the interface to be used.
If a target system is not defined yet, then the error message "Gateway not configured" is displayed.
Insert a Modbus TCP Master below the Ethernet adapter in the device tree.
Insert a Modbus TCP Slave below the Modbus TCP Master in the device tree.
Insert it in the Modbus Slave Channel tab and set the properties as follows:
Adapt the POU PLC_PRG as follows:
- Assign the variable wMasterSend to the output Channel 0 in the tab ModbusTCPSlave I/O Mapping.
- Start the project and set the variable xExecute to TRUE so that the new value is passed to the slave.