I have a Siemens S7 300 PLC with a CP 343-1 IT module for TCP/IP communication. I also have a FESTO FEC Compact PLC. i have to write/read data between the two. I used FETCH/WRITE options on a TCP connection, but it does not work. Does anyone know how to program a Fetch request on the FESTO FST in order to communicate with the native S7 TCP server in S7 300?