"Running a vi within a vi"

[maxpower]

I'm not sure if this can be done, but I'll ask just to be sure. Here's my situation: I have one vi that reads signals from a device. I have another vi that reads temperature from another device. I can't combine both vi's into one because of some problems with the vendors vi's provided by that company, so I must run both vi's seperately.

Here's what I need to do: I need to have the main vi and the secondary vi run at the same time, meeting these requirements - (1) when I push the start button on the main vi, the secondary vi starts as well. (2) The secondary vi has a waveform graph that must be displayed on the main vi front panel. (3) the secondary vi has indicators that also must be displayed on the main vi front panel. (4) when I p
ush he stop button on the main vi, the secondary vi stops as well.

Now, I've tried making the secondary vi as a sub-vi to the main vi, but I run into the same issues I had before when all of these were in one vi, so that
won't work at all.

I also read on the discussion forum about making the vi modal to the main vi - but from LabVIEW's point of view, I don't know how to accomplish this. Any
ideas?

[Dennis_Knutson]

I think you need to explain the problem that prevents you from combining the VIs. What exactly is the problem with the vendor's VIs? Can you run the two VIs separately now? If they work separately, maybe the only issue is that you need the main VI to continue running while the subVI runs? If that's the case, then you can use an Invoke Node and the method Run VI to start it. Using the methods Get Controls Values and Set Control Values, you can pass data back and forth between the two VIs.