Hello Randy,
So does the VI throw an error at all or does it just hang? Have you tried using highlight execution to see exactly where it's getting hung up at? There are a couple of reasons why I could see your programming causing problems. For instance, why are you starting and stopping the task each time in the loop? Generally, you only want to start the task once, before the loop, and then stop it after the loop. Starting and stopping the task each time will also slow down your loop execution time. I noticed you don't have any timing within your loop either. You should place a Wait Until Next ms Multiple VI inside your while loop so that you can free up your processor. Without this, your loop will run as fast as the CPU will allow and this will end up bogging down your processor making it harder for other tasks to complete, such as updating the chart on your front panel. A wait of 50-100ms is all that's necessary to free up your processor.
Also, whenever you use a task from MAX it should include the timing already so that you don't have to use the DAQmx Timing VI. A neat feature of LabVIEW is the ability to physically drag your task from MAX and generate an example from it. If you click on your task in MAX and drag it over to the block diagram in LabVIEW you will have a task constant placed on your block diagram. Right-click on the output of the task constant and select Generate Code » Configuration and Example. This will generate a configuration subVI which will create your virtual channel and configure your timing based off of what you have set in MAX, and then will also generate the rest of the code (DAQmx Start VI, DAQmx Read VI, DAQmx Clear VI, and the while loop if your task is set to continuous). Try this out and let me know if you are still experiencing problems.
Regards,
