Thread: Photoeye's not working-Difference between RoboRIO and Digital Side Card?
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Unread 27-01-2015, 08:17
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Re: Photoeye's not working-Difference between RoboRIO and Digital Side Card?
We have not got this far yet so I really have not tested anything. But. The RoboRIO is actually 3.3V (5V compatable) (If I understand what the NI guys said.)& the side car was 5V? Assuming you are not seeing the 0V state, maybe the Banner is not pulling the pin low enough?

Looking at the RoboRIO specification Low state is 0.0 V to 0.8 V. On state for the DS18 is <1.8 volts. So it working looks iffy. On state for the T18 is <1V The RoboRIO spec is on the NI web site.

Although looking at the NI 9403 (CRio DIO module) it has the same 0.8V max for V low Maybe it is more forgiving?
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Last edited by FrankJ : 27-01-2015 at 09:16. Reason: fixed decimal . in on state volts