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PM583-ETH OPC shut down problem

Hello,

I am working on PM583-ETH plc, and developing c# program to communicate the plc through opc. The program is working mostly, but sometimes the opc suddenly shuts down, the quality of tags become bad from good. When this happens, I exit the gateway and restart the plc couple of times and the opc suddenly starts to run and tags' quality become good. Do you know what may cause this issue? Why does the opc shuts down suddenly? If anyone has any idea, I would be glad of hearing it. I need help.

Thank you very much,

Irem.