Working to see if this scenario is doable using only PI-AF and event frames, no ACE, sorry ACE.
When a product is being made (Tag "ProcessState" = 1") I want to go to the midpoint in that time range and use a +/- 20sec window to understand the process variability.
The process State of course can be the ActiveTag in the event frame. And thanks to Ales's hint in the youtube (http://www.youtube.com/watch?v=UbideDwhawg, 2:36) the Duration of the event (in seconds) can be - albeit a truly hidden feature - calculated.
But then we get to a limitation of AF in that I can't compute or reference timestamps different then those passed by the parent event frame. Ideally inside the Event Frame I have attributes:
- Analysis Start Time = Event Frame Start Time + 1/2 * Duration - 20seconds
- Analysis End Time = Analysis Start Time + 40 seconds
- Variation
- Pi Point data reference set to standard deviation
I was looking for a way to create a child event frame with these analysis start/end times but at least using the Event Frames Generator, which only triggers on PI tags, that also doesn't seem do-able.
Ideas community?