[bvisness]

Aha - I think you do need to put that in a loop. I can't test your code due to missing VI's, but I think moving the variable write inside your main loop should fix the issue.

I think what was happening is that the variable write would only happen once, but then would never run again. Changing the control does not inherently trigger the variable write, so you need to make sure that it continually writes to the variable.