VBAI: Fire a pulse each msec N based on the State of inspection

The delay function VBAI seems to have the functionality I'm looking for, but that is so rude that the time is 1 second minimum.

I have a camera intelligent (1772). I do an OCR inspection that could take a variable quantity a little time. I would like an ejector will trigger if the inspection fails. The ejector must fire on a set amount of time after which the camera fires. If I can't do reliable, so I need another controller in the system that I should not need because the camera smart shoulkd be more than enough. I know it can be done in the RT, but I like to keep things in VBAI to facilitate customer training.

Sequence of operations:

1. travel less than 1772 on a conveyor parts

2 sensor triggers 1772 when a part is present

3 image is acquired and processed. OCR inspection

4. If the OCR inspection fails, the output pulse fire exactly 100 (for example) milliseconds after the onset of step 2

5. Repeat step 2

No idea how to achieve this in VBAI?

Thank you

Dan

You might have a step to generate impulses before your acquisition where the impulse is configured to generate a pulse based on a trigger (so set up a continuous pulse and you wire trigger for acquisition to an ISO so input line that will trigger the output). Now, this is the important part... you must ensure that your treatment is carried out before 100ms or some delay that you specify or the pulse will begin. If you determine that you need not pulse according to your treatment, the transition to a State where stop you a generation of pulses on this line to stop it before that happens. In both cases, passage to the final State, and then the inspection can start again with the State which has run impulses/Acquire/processes and therefore the pulse reconfigure again for the next part.

If this does not work for you, then you can try a timed SW approach. You might have a running LabVIEW step that gets a precise timer value during the acquisition stage ends, and another VI call waiting for a specified duration user (millisecond resolution) before it continues.

I recommend the first option because it will be hardware timed (but requires additional cables), and if it does not, I can help you with a VI that will make the timed SW the desired behavior.

Hope that helps,

Brad

Tags: NI Hardware

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