how do I start/stop a while loop programmatically inside a while loop

[freemason]

Hi,

can somebody help?

how to start and stop a while loopprogrammatically, not just by clicking run button of the vi,

ex:- main vi has a while loop and it has a inner loop, main while loop runs until i stop, but the inner while loop should start and stop on a button press.

[jcarmody]

This'll do it, but I'm curious about why you'd want to... 

[freemason]

thank you so much,

 I am trying to code the below picture

it should write 30 secs of data  every 8 hrs and this should repeat for 14 days.

see attached vi, im using 2 elapsed time vis to control this but if i use the 30sec timer inside inner while lt stops after 30 seconds and does not start whennext 8hrs elapse

so, i wanted to try to contol the inner loop, please see the elapsed timer.vi , any help would be much appreciated

[freemason]

also, in the vi you sent, the outer loop seems to halt for the time the inner loop is running, is it possible to control only the inner one while the outer one still keeps running and stop wen i press main stop?

[RavensFan]

No you can't have one loop running continuously inside of another loop that is also running continuously.  A structure can't complete its iteration until all structures inside of it have completed, which means the inner while loop has ended.  This is a basic understanding of dataflow withing LabVIEW.  

Since you are new to LabVIEW, I would recommend looking at the online LabVIEW tutorials:

LabVIEW Introduction Course - Three Hours
LabVIEW Introduction Course - Six Hours

[jcarmody]

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