I'm testing a simple expression in Performance Equation:
TagVal('TagName','*') - PrevVal('TagName','*') on a tag counter that is increasing by 1 every 10 seconds.
I'm expecting as result the value 1 anyway it doesn't work properly sometimes it gives 1 sometimes zero,
looks to me that tagval and prevval are not clear distingued.
Any helps in clarifing how it work is really appreciate.