I should have mentioned that both projects are test projects, with only bool PLC variable. The online simulation does not help as it says its not connected to a PLC. This is also evident as the COM1 light does not flash on the DVPES2, like it does with the MT6103ip. So there is probably no connection from the SVR-100 to the PLC. My concern is fixing this though.
I’ve tried this on 2 CMT-SVR-100s. One completely brand new, both with latest OS. This problem has completely stumped me. I might try get RS485 working with the 6103ip, then try it instead?