I have been trying to pass a controlling signal out of a running sub vi to start a case sequence that contains a measurement sub vi. I can't get it to work,can anyone help me.

Question

I have tried several different means of getting a controlling signal out of gl_flicker_vi. What I want is to pull the current iteration value out of the inner while loop, compare that to another value and if true, trigger the case structure that contains the Take measurements sub vi. I can get an indicator on the main vi to register the iteration values from the sub vi, but I can't use them to control the case structure. When I connected a reference to the control and then a property node within the sub vi, I alway end up with broken wires. Is there anything that I can do to
get values out of the sub vi that I can use for my purpose? Is there something that I don't know about using references and property nodes that I should at this point? Any help would be greatly appreciated.
Attachments:
GL_Flicker_mod.vi ‏88 KB
Take_Measurements.vi ‏147 KB
Pass_a_Reference.vi ‏69 KB

Answer 1

1-Apparently, you didn't wire an input for your DigNum Refnum, the ref to the inner loop index. That's where your broken wire should connect.
2- Better now : you could create a global variable of the loop index, that you can read anywhere in LabVIEW.
3- Anyway, your vi will not behave the way you want, since your comparison node will be operated by LabVIEW before anything comming back from GL-Flicker. Use a loop there ?
I think that you are a overusing propertie nodes, and I believe that there is probably a better and simpler way of doing what you want here...
Chilly Charly    (aka CC)
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