Event floods in audit event list: opc_e_unknownitemid(0xc0040007)

Hello,
Observed event floods in Audit Trial with the Category - AuditEvent_OperatorAction and the message as "Tagname (0x8) xxxxxxx OPC_E_UNKNOWNITEMID(0xc0040007). The item is no longer available in the server address space".

This item is writing values from External OPC Server and the values are updating correctly in the Control connection when i subscribed for live values. Please let me know what would be the root cause for the event flood.

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Sethu Murugan Rank: 445

Asked 1 year ago

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Answers

If you see flooding of OPC_E_UNKNOWNITEMID error messages when the external writer is connected but silence if you disconnect it, there must be some error in the external writer’s configuration?

Have it examined - even if you have 9 out of 10 items correct you will get error messages for the 10th.

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