Fix SEW-Omron Bidirectional PLC Communication

Our SEW DHR21B card used to exchange data in both directions with an Omron CJ2M-CPU33, but since the drive was reset to factory settings the PLC can only read; every write attempt is ignored even though no error messages appear on either side.

I can connect through both MOVITOOLS and CX-Programmer / Network Configurator, and I’ve already gone through the obvious network parameters yet I’m still not fully confident they match on both ends. Remote access to the on-site PC (and therefore to the live hardware) is ready whenever you need it for tracing, packet captures or online edits.

What I need from you is a clear diagnosis of why the outbound data from the PLC is no longer being accepted by the drive, plus the corrections implemented and documented so the link returns to full cyclic read/write operation. If new parameters, object mappings or network settings must be changed, please note them so we can archive the working configuration afterward. Ideally we wrap this up in a remote session, test writing a few words or bits to prove it, and call it done.