Event triggered lookback
Jordan Becquer
I am wondering if it is possible to make a derived function that will report the value of a parameter one second prior to a trigger.
Essentially: when a boolean transitions from true to false (falling_edge), output the value of parameter X at: (falling_edge - 1 second).
Chant, Adam
Jordan,
You would use a combination of the Prev(Parameter, nPoints) function to compare current value to previous value to catch the edge transition and another Prev(Parameter, nPoints) function to return the value back nPoints or for time GetUpdateRate(Parameter)*NumSeconds.
You can find details on these functions in the IADS Help under Operators and Functions. The Prev() Function has an additional page that describes conditional statements also.
Thank you,
Adam Chant
Project Engineer, IADS
Curtiss-Wright
190 Sierra Court A-3 Palmdale, CA 93550
T: 661.273.7003 x 2210
ach...@curtisswright.com
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Good afternoon IADS team,
I am wondering if it is possible to make a derived function that will report the value of a parameter one second prior to a trigger.
Essentially: when a boolean transitions from true to false (falling_edge), output the value of parameter X at: (falling_edge - 1 second).
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Jordan Becquer
I'm trying to get an event marker to display on (falling_edge - 1 second). So far I have an action object that will generate an event marker at the falling_edge using a derived boolean as the ExecuteAction, but I can't quite figure out how adapt it to instead display the event marker at a different time-stamp. Is this possible?
Chant, Adam
Jordan,
Apologies, but there is no direct method to set an event marker to an IRIG time value other than what is current time when the request it made.
You would have to go into the Event Marker Log and edit the IRIG time by hand to change it.
A script or .exe could be created that could do this, but nothing within IADS already has this ability.
To view this discussion visit https://groups.google.com/d/msgid/iads/422c8d15-d307-4941-9798-3853d8e7d1d4n%40googlegroups.com.
James Bretz
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