Datalink - count how many times a digital tag change state

Discussion created by MGendron on Oct 24, 2011
Latest reply on Oct 25, 2011 by Ahmad Fattahi

Hi community,


Sorry if this question is in the wrong forum but i don't know VCampus very well yet. So i have a digital tag with two possible state: "ENABLED" and "NOT ENABLED". I want to count in datalink how many time the value goes from "NOT ENABLED" to "ENABLED". I've trid a CalculatedData with a prevval('xxx') = "ENABLED" and tagval('xxx') = "NOT ENABLED" PI Expression but it return 604800, way too much for the week of test data i have. I also tried the EventCount PI Expression and it return 900, again too much for my test data...


Any idea on how to get that?


Mathieu G.