Issue with OPC tag's quality

Ignition
1

Hi,

I have a question about OPC tags. I have a gateway (Ignition 8.3.3) that is reading tags from an OPC Server, the OPC Server is Top Server / Kepware, and the issue is that some tags are in a quality status that is not good, it is Uncertain_LastKnownValue, but if I check the OPC server, the tags are in Good quality.
In Ignition, there are tags in good quality too, the tags in Uncertain_LastKnownValue seem to change their values not too often, I don't know if this low frequency changes is the reason of the Uncertain_LastKnownValue quality, so my question is if this could be the reason and if it is, how can we handle it, is there any configuration settings that controls that behavior?, because the tags due to the process itselft have a slow rate of changes.

Best regards,
Daniel Fernandez.

2

Would you be willing to periodically read a fresh value? I'll have to take a look to see when exactly they become Uncertain_LastKnownValue in Ignition, but very slow rate of change does sound like a probably factor.

How many tags are we talking about? I'm imagining worst case scenario you could script checking for any Uncertain tag values and then reading a fresh value. Alternatively, maybe you could put the slow tags in a different tag group with more appropriate settings?

Just spitballing. I suspect someone with more knowledge will come along an answer this, but if not, I'll circle back with more info after I've done some digging on my side.