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TagVal & PrevVal use in PE

Question asked by Alfons on Mar 26, 2019
Latest reply on Mar 31, 2019 by Dan Fishman


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.