Event frame start trigger can be set up to wait for predefined period using true for in the start trigger and include a condition that if process value is greater or less then trigger.
As an example, monitoring the electric system frequency, I have an analysis to trigger if frequency is above 60.08Hz or Below 59.92Hz. I would like an analysis that triggers if frequency deviates by .05Hz in a 20 second span, no matter what the starting value is. As I don’t have a static value to start the trigger, how would I express that? I am just learning PSE, so apologies if this is a simple matter and I am just not getting it.
To check deviation, you can use the Range function in an analysis; the format is Range('Attribute','start time', 'end time').
Now... to combine that with your existing trigger will require a little bit more work.
In the past, I worked with event frames that effectively had multiple start triggers and our solution was to create an analysis that looked at both start triggers and set a new trigger when either of the start triggers was true; and again, the same to end the event frame.
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Start Trigger :
(Frequency < 59.92 or Frequency >60 ) or Range(Frequency, '*-20s','*')>=0.5
( Frequency >=59.92 and Frequency <= 60 ) .... Please add deviation in End trigger only when required.