Loop communication

[77maxmustermann]

Sup guys,

Is there a way to make a VI outside a loop to take data from a VI that is inside a loop while it's running.

(My problem is that I have sub vi that has a loop inside of it and I want another VI that cannot be located inside of it to take data about the loop iteration)

You'll find a screenshot attached to this

[RMowatt]

Look into queues, notifiers, events, or even functional global variables.  These are all common practices for transferring data between asynchronous processes

[LennartM · Accepted solution]

This is one of the standard problems in Labview. You can use for instance a shared variable, stream, notifier or queue to communicate between the loops. Here are some examples: http://zone.ni.com/reference/en-XX/help/371361N-01/lvconcepts/channel_wires_intro/

The easiest is probably to take a shared variable.

[77maxmustermann]

Thanks it should work

[crossrulz]

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@77maxmustermann wrote:

Is there a way to make a VI outside a loop to take data from a VI that is inside a loop while it's running.

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Whatever is reading the data will also need to be in a loop of its own if you want to constantly get the updates.  If not in a loop, it will only read once.

[77maxmustermann]

Thanks for the warning. It's already the case