Why does my .vi not work when used as a sub vi
I have a vi that produces a picture on the front panel. Displayed in the picture are solid grey levels for testing. Two grey levels are chosen inside the vi and then the picture flickers betwen the two. When I run the vi by itself it runs wonderfully, but when I run it as a sub vi it does not work. Even when I just place the sub vi in the block diagram and connect all of the controls and indicators up it doesn't work.When I use the highlighter it shows that the control values go into the sub vi and the sub vi lights up, but there is nothing output from the sub vi to the wired indicators. When I open up the Block diagram of the original vi from which the sub vi came, and highlight it while running the subvi, it
shows that it is working with information running to all of the indicators. If I start a new program with only the sub vi in the block diagram and all of the controls and indicators connected, should it not behave as the sub vi? I will attach the vi that I am using as a sub vi, and I welcome anyone to place it in the block diagram of a new vi, connect all of the controls and indicators up and see if it works. I know that there is something completely obviopus that I am missing, but I can't see it. Any help would be greatly appreciated.
Attachments:
GL_Flicker.vi 74 KB
I think the subVI is working just fine when called from the main. I think what you're expecting is an indicator on the main VI to update as the subVI runs. What you will see on the main front panel is just the last value that a subVI has. That is the intended behavior of subVIs and function calls in all other languages. If you want to to update a front panel indicator while a subVI runs, pass a reference to the indicator into the subVI and update that reference instead of the indicator on the subVI. The other way is via a global variable. I've attached a modified version of your porgram.
Attachments:
Pass_a_Reference.vi 11 KB
GL_Flicker_mod.vi 66 KB
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