VI stops populating input after a few runs on Test Stand.

[-ZKL]

Hi everyone,

I have a weird issue with a VI I built.

1) The VI is supposed to tell if a LED blinked or not on certain period of time (around 2s-3s).

2) It is reading a digital input from a NI 9403.

3) Test Stand version is 2023, LabVIEW version is 2020.

The problem is that the VI works as expected for the first few runs and after a while it doesn't populate the inputs. I've monitored the VI using a breakpoint and I can see that after several runs it fails to read the inputs properly.

The VI runs 3 times the same exact test sequence and what I have noticed it that if I stop the sequences and click on the Test Stand "Unload all modules" option it starts working again, my guess is that Test Stand is holding a value between runs, but I don't know how to solve it. I think I can't entirely share the VI because I did not make the DAQ portion of it, but I made a debug version that I will attach to the post.

Has anyone encountered a similar issue or have any suggestions on how to solve this?

Thanks in advance for your help 🙂