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Subject Topic: How to Trigger based on global variable Post ReplyPost New Topic
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pingmustard
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Posted: January 06 2013 at 02:29 | IP Logged Quote pingmustard

I'm trying to create some lighting control logic based on global variable state changes.   However, I notice when triggers fire, I can't really condition the trigger on a previous state value. Is there a way to create trigger to capture when a global variable change from value A -> value B (not just any change)?

If a trigger is configured on modification of a global variable GV_SAMPLE, and a condition of "{GV_SAMPLE}=1" is used as the trigger Boolean, does the condition always evaluate BEFORE the global variable GV_SAMPLE is changed?

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TonyNo
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Posted: January 06 2013 at 08:51 | IP Logged Quote TonyNo

I think you would need to add a variable to track the previous state.
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dhoward
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Posted: January 06 2013 at 13:31 | IP Logged Quote dhoward

Actually, [TEMP5] contains the new value and [TEMP10]
contains the previous value. So you could use this in
the boolean field to trigger only on specific values.

If you want to trigger ONLY when a GV changes from value
A to value B, then you could use this in the boolean
formula:

ph_getvar_s(2,10) = "A" and ph_getvar_s(2,5) = "B"

Hope this helps,

Dave.
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pingmustard
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Posted: January 14 2013 at 00:49 | IP Logged Quote pingmustard

That seem to have done the job.

Thanks Dave!
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