Boolean values from modicon OPC UA PLC are logged in historian core strangely

[aaronrsturm]

Howdy,

Boolean values in my historian are not being recorded as true or false, instead the tag history just counts up or down forever, I see the same behavior with a memory tag or a OPC tag from my PLC.

I am using ignition maker edition 8.3 and historian core, so I don’t know if this is the normal behavior of historised boolean values, but I was expecting them to just be recorded a 0 or 1. Here is an example power trend of 2 boolean values (heat is currently on, cool is off).

And the associated tag configuration:

[andrew.budaiev]

Do they come as Booleans in the Tag Browser?

[aaronrsturm]

Yes, If I browse and add tags directly from the OPC server they are automatically added as booleans.

[Matrix_Engineering]

Welcome!

Some further insight for you:

I’m trying to understand the recommended best practices for configuring Ignition Tag History, specifically how the following pieces are intended to work together:

• Tag Group (normal execution rate) • Historical Tag Group (e.g. Default Historical) • Sample Mode (Tag Group vs On Change vs Periodic) • Deadband Style (Auto vs Analog vs Discrete) I understand that the Tag Group controls how often the tag is evaluated/read, while the Historical Tag Group controls how often the historian evaluates whether a sample should be stored. However, it’s not entirely clear when it is best to reuse existing tag groups versus creating a dedicated Historical Tag Group,…