How can I generate a single timer event in a loop?

I have a simple PID script running inside of a timed loop to control a heating process. It works perfectly except that I cannot find a clean way to start the timer when it reaches the setpoint.
Right now, the loop just runs for a set amount of time (e.g., thirty minutes). I want it to run for a set amount of time after the heating reaches the setpoint. I can think of several ways to fudge this, for example with a couple of shift registers and a case structure or with a second loop, but these options seem very clunky.
I am sure there is a better way. Can I somehow create an event within the loop that only happens once, for example, to give a timer value one time when a boolean value changes and never rewrite it?
Thanks in advance for your help.

You could keep the boolean value in a shift register or a feedback node. You then need a little bit of logic to check to see if the boolean changed from false to true. From there, you can put in your get timer inside of a case structure.
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Hi Sihem,
Thank you for contacting National Instruments. Using the LabVIEW Real-Time module, you can do development without actually having a target. While viewing the project explorer window, you can do the following steps:
Right click on the project
Select New >> Targets and Devices
Select the "New Target or Device" radio button
Select the target you would like to develop on.Information about the LabVIEW Real-Time Module can be found here.
Regards,
Kevin H
National Instruments
WSN/Wireless DAQ Product Support Engineer

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