concurrent tasks HAVE, AO, c, CI

Hello

I try to control a, AO, CI card SMU-6358 simultaneously and for that I built the VI attached. If I run the VI, it does the job without any problem, but if I connect the appliance on the pin of the IC [at the door of for example ctr0] to measure the frequency of the signal, less than a second, I get the error message "tried to play back samples that are no longer available" [image attached]. Can someone please advise me what I am doing wrong.

Thank you.

Hi Kriváň,

The problem is that you have two tasks of entry in the same thread who buy data at different speeds.

The task of IT is clocked at all that note you the value.  It crashes the loop so that the desired number of samples were acquired.

The task of the CI is configured for 'Implied' timing, which means it will snap into place in a sample for each period of your input signal.  If the input signal is too fast then the loop (whose rate is regulated by the task to HAVE it) will not be able to follow.

In almost all cases, if you have two tasks, acquisition of data in the same loop that they must be synchronized to ensure that a single task acquires data more quickly than the other.

Do you need to acquire a sample of counter for each period of your input signal?  Depending on the frequency of the input signal, you might want to review the sample clocked frequency measurement method that is supported on your table for the X series.  The easiest way to get the program to work would however be to run tasks in parallel, or if you do not need to set buffer samples of your task of frequency, you could simply remove the schedule for the task of counter altogether.

Best regards

Tags: NI Software

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