How do I count parts with a fiber optic sensor using the NI-1772 and VBAI 2011?

I'm inspecting parts using the NI-1772. Just after the camera, bad parts are ejected when they pass by a fiberoptic sensor. I want to use another sensor after that to verify the number of good parts, so that I can be sure the bad parts have been ejected?
I've tried using the READ/WRITE I/O step to read falling edges in sequence with a calculator step to increment the counts for each inspection iteration. I get a few counts at start up, and then the counts stop. It's as if the inspection has looped back to the Acquire Image step before or after the cap is present at the sensor.
Once this is figured out, I want to reset the count when a preset is reached.
Thanks,
Rob

Hi Brad,
It seems that the ISO Input is reading all of the falling and rising edges based on the LED, and that the Read/Write I/O step counts all of the falling edges when in configuration mode. I believe the signal stays low for about 10ms. (It might be important to clarify that I'm not using the camera trigger input for this. It is a subsequent sensor downstream of the camera.) I've attempted to attach a section of my inspection.
Thanks,
Rob
Attachments:
Section of RS38_3JAN13.vbai ‏96 KB

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