I have two tags, I want tag A and B (bools) to go high at the same time, but I want tag B to go off 30 minutes after tag A does. What is the best way to accomplish in Ignition, no PLC involved in this application.

What ever event occurs to turn off A and B, have it write a timestamp to a tag. Then you can compare now to that time plus what ever offset you want and keep B true until then. The same would work for a TON configuration, you would just keep B off until the set time elapsed.

I would use Louis' approach, but have the event on tag A add the time interval to now() before writing to the timestamp tag, so that timestamp tag has the cut off time. The expression tag for B would then have: {[.]A} || dateIsAfter({[.]CutoffTS}, now()) Adjust the now() fragment for how precise …

There is nothing new under the sun... lol [image] Timer ON and timer OFF Ignition UDT attached. Monitor has two Diagnostic level alarms for TON and TOF operation. Expression tags bound to each alarm isActive flag. Integer tags for TON and TOF time values. li…

TOF Style timer with tags (no PLC)

Ignition

JordanCClark September 28, 2026, 12:09pm 4

There is nothing new under the sun... lol

and also this one for a bit finer precision.
TimerUDTmillis.json (2.1 KB)