I try to query CIMPLICITY OPC server with the PI OPC interface. The OPC tools, like Matrikon Explorer or even PI OPCClient are able to connect and to obtain data. But the service created by ICU when running writes nothing to PI and shows following messages in pipc.log file:

cannot have polled tag in scan class 1

Developer load structure failure

What could that messages mean? I get them even if try to poll tags from local test Matrikon OPC Simulation Server, so it's definitely an interface problem, not that on the side of OPC Server.

Thanks in advance!

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Thank you, I resolved the case messing around with Scan Classes. The default one was in milliseconds and that was unacceptable for Cimplicity OPC. I used seconds and everything finally worked. What I need now is to find out, how to set data aquisition to write data precisely at 01:00, 02:00 and so on. It begins now with time the interface service starts and writes every minute but not on zero second timestamp.