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Why would OPC Tools show bad and good quality for a tag at the exact same time in DeltaV

Question asked by AndyOlsen on Jul 12, 2019
Latest reply on Jul 30, 2019 by gmichaud-verreault

I have a situation with two DeltaV app stations running OPC DA interfaces to a PI system in a failover setup.

There was an issue last week where the primary failed over to the secondary interface machine but nobody can tell why.

There was an 8 second delay in data from the tag to the ACE scheduler that didn't match up with what was in DeltaV until the interface was restarted.


Unrelated, but same interface/system, looking back at a tag with the OPC Tools, it shows this;

Is it normal to have BAD and GOOD quality for the same timestamp coming out of DeltaV? The Interfaces are set to Store Value Flagged Questionable in the OPCint settings.


Could this be the cause of the time delay in the PI reporting?