I have an application where I am using DAQ assistant within a VI to control a DAC on a National Instruments PXI card. At the end of the VI I use DAQmx Stop Task and DAQmx Clear Task to close the task. The VI works fine if I run it by itself, however if I call the VI from our homebrew test executive, it only runs fine the first time. Subsequent calls to the VI result in error code -200429. Documentation on DAQmx Clear Task states "You cannot use a task after you clear it unless you recreate the task". I think this is my problem. What is the easiest way to fix this problem? Should I delete DAQmx Clear Task (if I do this are there memory leak repercussions)? Should I convert the DAQ assistant (Express VI) to a standard subVI, and then modify the created standard subVI to ensure the task is recreated?

LabVIEW

Problem using DAQ assistant

Hi,

We want to help you but there is a slight difference in understanding your problem. Dennis has provided the right suggestion.

You will have to switch to DAQmx functions if you want more flexibility in the program.

You can also use the method Will suggests --do not clear you task and let them be there and do not recreate them in your subvi(use first call function)

can you attach the screenshot (printscreen)of your problem for us to have better idea.

Regards

CLAD
Using Labview 5.1,6.1,7.1.8.0

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