As you can see, the communication between the CLP and the Ignition is working just fine, when I’m looking at the OPC Quick Client.

But inside my application, this Uncertain_InitialValue appears.

Have you tried binding Low_level_T1 to a component on screen? I’ve seen that before on new tags, granted it was with a Leased tag group and not the Default (Direct) tag group.

Edited to add: Another thing to check is the tag group of the uncertain tags. If the tag group does not exist, the tag will never be polled. I stumble into this occasionally when importing tags with custom tag groups.

Yes, I have, but the problem kept appearing.
Although, I have already solved the problem.
Solution: Just waited until the next day and all those problems related to uncertain values of tags were gone.

Hello all

I had the same problem, I solved it stopping Ignition and starting it again.
In C:\Program Files\Inductive Automation\Ignition, here is the option to stop ignition.