How do I make something happen only once on a true condition in a loop

So I have a way of doing this, but it uses a dreaded local variable, and seems to me that it might be unreliable.
What I want to happen is to have something happen only once on a condition that will remain true. What I need is to set something after a given amount of time, but I only want to set it once after that time has been reached. Problem is, if I use a range, it could be true more than once, if I use a greater than, it'll be true every time after the set time, and if I use an equal, there's no way to know that the particular millisecond value will even appear in the loop.
Maybe I'm wrong in even using those comparison functions... Any ideas would be greatly appreciated. See the attached vi for a better look at what I'm trying to do... (v7.0)
Thanks,
Geoff
Attachments:
Question.vi ‏16 KB

The "Idle" state that the help file refers to is the "non-running"
state. The Top Level VI must end execution before any "First Time" VIs will
return TRUE after being called initially.
Therefore, if your application calls a subVI at the beginning of the
Test portion, on the next iteration of the loop it will return FALSE
from that subVI, since your main VI never stopped running, and received
a TRUE from the "First Time" on the initial test loop.
If you have code that you want to execute only on the first run of your
entire program, "First Time" should work fine. If you have code that
you only want to execute on the first iteration of just the Test loop,
the "First Time" VI is not ideal.
I think that shift registers are going to provide the best solution,
however you mentioned that for your particular application that is not
ideal. Could you describe a little bit more why shift registers are
problematic?
Thanks Geoff, let us know.
DWeiland
Applications Engineer
National Instruments
www.ni.com/support
Dan Weiland

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How do I make something happen only once on a true condition in a loop

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