Read and write data at different rates, parallel loops.
Machine monitoring and datalogging application.
imple question, maybe not so simple answer.
I want to read fieldpoint channels at a certain rate, say every 2 seconds, so I can verify satisfactory operating conditions of a machine under test.
I then want to write these values to a file at less frequent intervals, say once an hour, as I have no need to record all the data if the machine is running correctly.
I thought parallel loops with "wait until next ms multiple" would be the way to go, but I am having trouble ensuring that the slower loop actually grabs the values I need. I am not clear on the intricacies of shared variables, local variable, and queues and not sure which way I need to go.
Semaphores didn't seem to work for me as the faster loop grabbed control and the slower loop couldn't sneak in to read its values.
Any help would be much appreciated,
Thanks
I would use a queue. As you gather data, enqueue the data. In the slower loop, process the data queued so far by reading from the queue until it is empty. You can use the Queue Status vi and then flush the queue to get ready for new data.
Here is some sample code to get you started.
Message Edited by tbob on 08-06-2007 06:00 PM
Message Edited by tbob on 08-06-2007 06:01 PM
- tbob
Inventor of the WORM Global
Attachments:
Queue.png 8 KB
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CLADYou could try something like the attached vi.
Cheers!
CLA, CLED, CTD,CPI, LabVIEW Champion
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Don't forget Kudos for Good Answers, and Mark a solution if your problem is solved.
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