Can an output data generated within a loop in a sub-vi be transfered to the main program for each iteration of the loop ?

[Ray.R]

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@Zekasa wrote:

Or does it mean that I have to write to the global only once?

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Do a search on "Worm" global

[Zekasa]

Thanks Ray,

I was when I saw ur reply I became .

I will see the Gloabl worm, and hope to get more understanding.

thanks

[Ray.R]

Zaki,

There's no need to get angry..  I still learn many things from this forum.  Expertise is a relative word..

Just do your thing, have fun, share & learn.

And it's okay to get upset every once in a while... Otherwise, we wouldn't be human, would we?  😉

Cheers,

RayR

[tbob]

Below you will find a link to the Worm Global.

Queues are fine and dandy, but I'm surprised nobody mentioned using a reference.  Queues are probably quicker, but its worth looking into the reference solution.  In the two attached VIs, the main calls a subvi.  The subvi runs a loop where a variable changes on each iteration.  That change is displayed in the main as it happens by using a reference and the Value property node.  Property nodes are slower than queues, but the coding is simpler.

[Yoyo87]

Hi tbob,

Thanks very much for your message. I will evaluate the possibility to use references. It looks easier indeed.

Thanks for the examples, that's reaaly nice to have a direct reading of an illustration of what you propose.

Thanks a lot.

I'll try it.

Cheers,

yoyo87

[Ray.R]

References are fine as long as you do not need to synchronize between when data is ready (available) and it reads only new data.  If you pass only a single data, then a Notifier would also do the trick.

There are many choices to choose from.  It usually depends on exactly how you want the sw to behave.  Which brings another topic (that I gave up within the forum), which is "designing the software".