Stopping for loop

[Markske]

Hello

I’m trying to stop a for loop of a subVI while it is still running. In the example you can see my problem. When I run the main VI the loop begins. When I press the stop button (in the main VI) the loop first finishes and after that the VI stops. Is it possible to program that when I push the button the VI immediately stops?

Thank you in advance

[chilly_charly]

A solution is to use a global variable. Create a stop button as global, and use it from your main vi, in a separate loop to stop the sub-vi.
There are a number of possible alternative solutions, such as using references, queues, dynamic vi's, but this is definitely the simplest one.

I have attached your vi, after a few modifications. Try to improve your coding style.

[Markske]

Thanks charly! Now it works!

[becktho]

Hi CC

Did you really stop a for loop? If so - could you attach the library as LV7.0? I'm wondering how you could have accomplished that.

Thanks in advance.

Thomas

[chilly_charly]

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becktho a écrit:

Did you really stop a for loop? If so - could you attach the library as LV7.0? I'm wondering how you could have accomplished that.

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Sorry to disapoint you Becktho, but the loop was a while loop. And anyway, I would have replaced it ! 🙂

I agree with you, the possibility to leave a for loop would be of interest, although a while loop (actually a repeat-until loop) is easy to use. But the diagram could be simplified. Imagine : right-click the loop border, and select "create conditionnal exit", just bellow "add shift register" 🙂
On another hand, having only two types (actually 3 with the timed loop) of loop structures is also quite simple. Have you noticed how beginners are confused by the number of different wire types ?

[becktho]

Hm...

Maybe more confusion leads to more newbies taking courses.

Anyway - I wouldn't need a "conditional exit". I'd prefer a "break"-function, which could be used in for- and do-while-loops and I'd already be glad if there was a real while-loop available. But that's the topic of another thread...

Thomas