Every PLC has some IO connected, some of witch are sensors that we also want to monitor outside of the PLC. The key element to this is the OPC server SIMATIC NET. This server talks to the PLC's, and makes the different tags available to other pc's.
This makes the OPC server really critical for the function of the other parts of the system.
I literally just spent days trying to get this up and running. Every option was set correctly, except this hidden "enable communication" setting on the PLC:
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