I have a problem - I have an S7 400 PLC and an S7 300 PLC, but no additional I/O devices (yet). I want to write and test my S7 code (which should run on the 400), and have it access I and Q addresses normally and react to them, but as I cannot assign them any physicak I/O's yet, I would like to map I and Q addresses to the memory of the PLC 300. Can I do such a thing? Do I need any additional hardware (CP's? Profibus? Ethernet? TCP/IP?)? Software? gsd's?
