I'm a newbie to modbus communication. I have a Festo PLC and have configured the Modbus TCP server and can connect to it using a freeware Modbus TCP client
Now I want to test the addressing. Apparently the addressing insde the Festo PLC is open and the user is free to choose his own addressing. I'm not sure if I have to write code in Codesys to map the IO and then address these addresses from the client? Or does Codesys provide a way to define this addressing?? Please advice or provide example if available.