Toshiba model 3000 Vseries

We have Toshiba vseries PLC, S3PU55 that talks to a GP577R proface panel thru RS485. It worked fine until lately we installed a Kepware OPC server that talks to Toshiba PLC, Allen Bradley contrologix and DEC Alpha. Whenever we enabled the OPC in Toshiba PLC, GP577R stops working and go blank. When we disabled the OPC, GP577R starts working again.

Kepware guys said that it is in Toshiba PLC configuration. Is there a way for both serial and OPC to work in Toshiba PLC?

We put a lot of memory space between the one's being used by GP577R serial to the start of OPC memory.

It's up and running for a couple of weeks now.