All,

Since my expertise(such that it is) does not encompass baggage handling systems per say; Can you help me answer the following question?

When tracking through a conveyor section with a speed of 66 feet/min, what is the debounce set for the PE, what is the equivalent length equal to?

The same question for 30 ft/min?

Thanks guys for saving me a lot of work!

The hound

Hopefully you can clarify some things and get a better answer to your question.

DEBOUNCE - Is this how long the eye must be blocked before it reports as blocked, how long it must be clear before it reports as clear or both?

Whatever your answer to the above the setting of the timer will depend on how much of the bag you want past the eye before it responds.

66 ft/min == 792 in/min == 13.2 in/sec so 303 ms == 4 inches for example.

30 ft/min == 360 in/min == 6 in/sec so 250 ms == 1.5 inches .

Hope this helps you some.

With debounce timers (timers used to handle "jitter" in the inputs from photo eyes, etc.) what I actually do in practice is to measure it. I just set up the highest resolution timer available in the PLC for say up to 3 seconds of total time. At each scan, I look for change of state on the input. If there is, then I store the value of the timer in a circular buffer, and reset the timer. Then it's a simple matter to look at the numerical data itself and make a determination as to an appropriate debounce timer length.