Hi. I am trying to build an alarm system for triggering an alarm whenever a given valaue is reached. Is there any way to get a action which triggers a valaue change in a event structure whitout having to use a button? I.e: If the simulated valaue reaches 45 i want a H alarm to go off, if it rises to 50 i want a HH alarm to go of, etc. See attached VI.

Ken_Naylor wrote: To reiterate, Val(sgnl) ALWAYS fires the event regardless of whether the value is a change from the last value. The false cases are empty Also note that you will keep getting the alarm event each iteration as long as this is TRUE. If you just want a single event when the alarm condition goes TRUE, you will want to add a Boolean Crossing PtByPt to detect the transition from FALSE to TRUE and use that for the case structure.

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Use boolean valaue change to trigger valaue change in Event structure

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Boolean Crossing PtByPt was the answer! Thanks!

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Use boolean valaue change to trigger valaue change in Event structure

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