subVI

[phyyu]

Hello guys,

I am facing a basic problem in using subVI. In the subVI, I let the LED lights switch to flash periodically. Then I would like to use this subVI in other VI, but no output in the main VI. I highlighted the process and found out the data flow stuck at the subVI. I think it is because the data flow can go through the subVI only after it finished, since the while loop inside the subVI does not stop, the subVI could not finished. Is there any solution about this problem? Thanks a lot! 

[crossrulz]

The subVI probably should not have a continuously running subVI.

One option is to use a queue or notifier to send the data to the main VI.  But I still question your architecture.

[phyyu]

so, you mean, in my case, I should not use subVI?, use the code in the main VI directly?

[Dennis_Knutson]

No, that is not at all what was said. What was said and what I agree with is that the subVI should not have the loop. The simple solution is to have a loop in the main VI.

[phyyu]

I see. But what about I need to repeat this loop several times? I have to repeatly use the loop in the main VI?

[RavensFan]

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@phyyu wrote:

I see. But what about I need to repeat this loop several times? I have to repeatly use the loop in the main VI?

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Yes.  By definition that is what a loop does.  To repeatedly use it.

[phyyu]

well, I don't think it is a good idea to use a several same function loops in another big loops...

[RavensFan]

You take the loop out of the subVI.  Put the loop in the main VI.  This is what Dennis was telling you.

[phyyu]

thanks guys, I will try.