Continued use of digital dashboard to stop a generation pulse train

Hello

I need to generate a train of pulses for a period of time. However, this period is variable, and because of that I can't

Use the finite number of samples.

The pulse train must be output depending on the State of the digital I/o. When the line output goes high, must be output of the pulse train.

and when he goes down the pulse train should be stopped.

I use a USB-6212, but is already using one of the available counters for the measurement of pulse width. I tried to do a

AND logic with the pulse train and line activate, but due to the execution time of vi this solution modifies the pulse train

frequency, which is not acceptable.

Thanks in advance,

Mariana.

Hi Marianne,.

Your previous message mentioned "line in/out" (in the singular) and "enable line" (in the singular), isn't "the i/o lines" (in the plural). Are the two edges on the same line in/out? Or are they on separate i/o lines (for example, climbing on PFI0, falling on PFI1)? Can you clarify your needs?

If the fronts and sides come from the same line of output, then a relaxing break seems to do what you want: cause the meter generate impulses while the input/output line is high and cause the meter to stop while the input/output line is low. However, if you start the job, while the input/output line is high, it will immediately start out impulses. If you want to wait the first front line input/output to generate impulses, you can use a trigger 'start of arms' (which is just below "break" in the node property). When the trigger 'arms beginning' arrives, the meter will be armed, and therefore, the task uses the break to determine when to generate impulses. Using pause and start the same counter task returns error-200146, "put in Pause and start triggers cannot be active in this task," but using break and triggers 'arms beginning' in the same task of counter should be correct.

If you want to increase the edges of PFI0 to start the meter and the fall of the edges of PFI1 to stop the meter, which is more complicated and it will take thought additional (and possibly additional hardware).

Brad

Tags: NI Hardware

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