Unloading a VI

[vamsi539]

I'm working with a Vi that is repeatedly used in the Teststand Sequence.I find the Vi works when It is called the First time but  does not for the subsequent calls.

I tried the Unload options in the Properties - unload option and that did not help. I can use the File-' Unload all modules' to get it working but I would like to use an automated way of doing it.

I saw a post on the forum that talks about this problem,the solution entered there is for Teststand 4.0 and I could not relate it to the version I'm using(3.5)

Any ideas on how to unload a Vi after it is done executing ?

http://forums.ni.com/ni/board/message?board.id=330&message.id=17257&query.id=1043600#M17257

Thanks

Vamshi

[GuenterMueller]

Hi Vamshi.
See attached zip that comes with some VIs (used as SubSteps) saved with LV8.6 for test purposes.
If you do not have LV 8.6, just use the Sequence "Unload ..." in your code.
Hope this helps, Guenter

[Dennis_Knutson]

Loading and unloading seems like a band-aid solution. The best thing to do would be to fix the VI so that it works every time it is called. You don't have much of a description of the problem except the VI does not work. What exactly does not work? Is there an error generated? If so, what?

Can you post the VI and a sample sequence that calls it?

[GuenterMueller]

Good point, Dennis. Of course, unloading any modules should be avoided.
Unloading and reloading wastes valueable time. Better: Work on the problem, that the VIs have.
Thanks for pointing it out, Dennis.
Guenter

[vamsi539]

Thanks for the information. I never thought it would be something to do with the Vi.Whenever I execute the Vi it works just fine,but when I call it from teststand it worked only for the first time.This made me doubt it is a unloading issue.

 Info:

I'm working on CAN messaging,When I send a message (0X7E0) on the Bus,the module responds with the resquested information on message (0X7E8h). I'm using this Vi repeatedly in the Teststand sequence.

When I say the Vi does not work on subsequent calls,there is no error message,but just that It does not do its job,in case catch the response (0x7E8h) on the bus.

When I do the unload all then it works for any subsequent calls.

From your response I think I might not be closing/ending the Vi properly.I'm posting the Vi and any ideas to improve it is appreciated.

[Dennis_Knutson]

I don't use CAN so I'm missing those subVIs and obviously can't run it.

Your VI is messy and I did some cleanup to see what you are doing (attached below). What you could do is set a breakpoint and step into the VI.