Timed counter in a while loop without overlapping a second while loop

Hello,
Like you can see in attached file (waveform_counter.vi), I have a main while loop which makes a waveform graph and I would like to integer an inversed counter (from x seconds to 0) in some cases. I tried with a overlapped while loop, but obviously, when the counter works, the main loop breaks...
How can I make a sort of time counter without a loop ? I tried with the while loop iteration, every 100 iterations the counter decreases but I don't success.
Thanks for help.
Nathalie.
Attachments:
waveform_counter.zip ‏55 KB

Hello Nathalie:
Please see what I did in the expiration case.
Please advice if this is a possible solution.
Attachments:
waveform_graph 2.zip ‏41 KB

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