Hi All
I would like to check if there is any feasibility in AF EventFrames where we can use StartTime of Event Frame to determine in the End Trigger .
E.g.
StartTrigger : TagValue > 100
EndTrigger : TagValue <=100 And (Int(*)- Int(EventFrame('StartTime'))) > 100 ( seconds)
Thanks,
Lal
Unfortunately, that method will not work. You probably have seen a number of alternatives to obtain the start time such as using an analysis (duplicate logic in an anlaysis), using PI OLEDB Enterprise with a tablelookup, or using a custom data reference.
Hello, i think that it can to work with TimeStamp and PreVal functions if this are composed.
The expression could be:
EndTrigger : TagValue <=100 And (Int(*)- Int(TimeStamp(PreVal('TagValue', *)))) > 100 ( seconds)
Hi Lal,
I am not sure but from the logic you have written, it looks like you are trying to see if the End Trigger (TagValue <=100) is "True For" more than 100 seconds, which is available for "Start Trigger". It comes handy when the data hovers just above "Start Trigger" condition and can fluctuate creating multiple Event Frames.
Or are you trying to capture Event Frames, which have duration over 100 seconds?
Depending on these above assumptions, I guess you can achieve it by following the steps below.
1. Set "True For" in Start Trigger so that it avoids duplicate Event Frames
2. Modify the "End Trigger" to check if the Tag Value is below the limit and also it has stayed below the limit for set amount of time (say 100 seconds in your case)
3. Set Event Frame Analysis to "Periodic" (1 second)
Not sure if this meets your requirement, but this was as close as I could get using existing features.
Else, as Dan Fishman mentioned you may have to find alternative way to do this.
Thanks,
Jaison Rodrigues
I was also wondering if there is anything special about your requirements that is preventing you from using the 'True For' functionality in the event frame generation.
Hi Vince
Tried this option and would like to close the event using "EventStartTime" i.e. Timestamp('Tag1') - EventFrame('Starttime') > 600 and Tag2<0
Start Trigger : ('Tag1') > 0
End Trigger : Timestamp('Tag1') - EventFrame('Starttime') > 600 and Tag1 <0
Thanks,
Lal
on Oct 2, 2018
Hi Lal,
I am not sure but from the logic you have written, it looks like you are trying to see if the End Trigger (TagValue <=100) is "True For" more than 100 seconds, which is available for "Start Trigger". It comes handy when the data hovers just above "Start Trigger" condition and can fluctuate creating multiple Event Frames.
Or are you trying to capture Event Frames, which have duration over 100 seconds?
Depending on these above assumptions, I guess you can achieve it by following the steps below.
1. Set "True For" in Start Trigger so that it avoids duplicate Event Frames
2. Modify the "End Trigger" to check if the Tag Value is below the limit and also it has stayed below the limit for set amount of time (say 100 seconds in your case)
3. Set Event Frame Analysis to "Periodic" (1 second)
Not sure if this meets your requirement, but this was as close as I could get using existing features.
Else, as Dan Fishman mentioned you may have to find alternative way to do this.
Thanks,
Jaison Rodrigues