Calculated tags from OPC tags

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1

I have a few OPC flow rate tags that I would like to add together to create a total flow rate tag. For example flow1+flow2+flow3=Total flow. I then want to log the calculated tag in the same table with the OPC tags. I’m wondering if Fsql can do this and what the syntax would look like.

2

Just put the 3 tags in a historical group and add an Action Item that adds them together.

Right-click or hit CTRL-Space in the action item expression box to bring in the other OPC items, it will look something like:

{flow1}+{flow2}+{flow3}
3

Yeah, what Carl said, plus I wanted to add: if you only want to store the calculated value and not all of the inputs, just make them “Read Only” (found on the item edit screen).

Regards,