Passing the result of a sub VI with event structure back to the top VI

[QuantumPenguin]

Hi All

I am experimenting with using event structures in sub-VIs with the eventual goal of consolidating a very large control system I am working on.

Attached is the toy-model I am working on. The VI works in the sense that the top level VI can control the the sub level VI, but then I want to pass the results back to the top level -- in this case it just a a Boolean LED indicator. I think I could achieve this using a refnum indicator and then converting this to boolean with a property node in the top level VI but this feels a bit clumsy.

VIs are attached!

[RavensFan]

Yes.  You need to pass in refnums of your indicators on the main VI.

This isn't clumsy.  What is clumsy is having a subVI that runs forever.  Your main VI can technically never end without aborting your program because once it calls the subVI, the subVI has an infinite while loop.

[QuantumPenguin]

Okay I see. What would you suggest to implement what I am trying to achieve in a better way?

[RavensFan]

I don't really know what you are trying to achieve.

Why do yo have a subVI with a while loop in it?  Not that you can't do that, but when you do, you are going to treat it like a parallel process. That means not having indicators directly based on it by way of its connector panel.  Also you need a communication mechanism to tell it when to shutdown.

[QuantumPenguin]

Essentially code reduction. I am redeveloping a very large control system. This system currently has about 20 different event structures each containing relatively complex code. I want to bundle these individual routines up into subVIs to make everything more manageable, hence my experimenting with the attached example.

[altenbach]

I guess this is a continuation of this earlier discussion. Why not keep it all in one place?