Hello World,
I was looking for some help on using PI Performance Equations.
I would like to know the number of times a pump has turned on (from time X to time Y) but only when that same pump has been on for >10 mins. So i was experimenting with different extraction methods and settled upon the following:
Using the Calculated Data datalink option, I have the following set:
- Expression: (TimeGE('pump tag', 'start_time', 'end_time', 0) > 10)
- Filtered Expression: ('pump tag'=1 and prevval('pump tag',curtime)=0)
- Calculation Mode: Count
- Calculation Basis: Event
I'm getting results that look in line, but without a full understanding of the TimeGE function, i wasn't 100% sure. Does the anyone know what the output of TimeGE is (days, hrs, mins, sec)? Or if the Count mode will give me what i think it is.
I'm also open to other filtering criteria if anyone else can think of one. Any help would be appreciated.
Thanks