Bringing value from 1 VI to another VI in the same Project file

[S.Neo]

Hi,

I would like to bring a few value from the main VI to another VI under the same project file but I am not sure what is the best method of doing it. Is it by using global variable or by subvi? 

Thanks

[crossrulz]

There are many ways to pass data around.  Which method to use is based on what you are trying to pass around, to who (most as in how many processes), who can update the data, etc, etc.  In general, I find Queues and User Events best for passing data around.  Again, it would help if you gave a lot more information about exactly what you are trying to do.

[S.Neo]

Hi,

The value passed can only be changed at the main VI. I am just passing a few dbl values that's all. It will be best if i can use the values passed in some arthemical function 

[Bob_Schor]

I would say that most of the variables I pass between sub-VIs are passed by wires going into 2-3 Connectors (I'm not counting the Error Wire, which is almost always coming in on the lower left) and out through 2-3 Indicators (again, not counting the Error Wire).  Very quick, very simple, very "DataFlow".

Bob Schor

[S.Neo]

Sorry but it is possible to have an example of passing of variable using subvi ?

[crossrulz]

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@Bob_Schor wrote:

I would say that most of the variables I pass between sub-VIs are passed by wires going into 2-3 Connectors (I'm not counting the Error Wire, which is almost always coming in on the lower left) and out through 2-3 Indicators (again, not counting the Error Wire).  Very quick, very simple, very "DataFlow".

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Bob brings up another good point.  Are you trying to pass data to a process that needs to run in parallel with the producer?  If not, then just call the VI directly and use the connector pane.

If you are running in parallel, then my next questions are:

How often are the values updated?

Do you need to process every value or just the latest value?

[S.Neo]

Yes, it will have to be run in parallel. The value updates every 1 mins

[S.Neo]

Sorry, I would like to edit the question. 

Is it possible to pass values back and forth between 2 VI? 

Both VIs will be running concurrently.

Thanks

[GerdW · Accepted solution]

Hi Neo,

yes, that's possible!

Spoiler

global variables, notifier, queues, FGV aka AEs, …

When you keep asking such basic questions you should take the free online resources offered to help you learn LabVIEW and DATAFLOW!