PNP versus NPN sensors

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Originally Posted by Kevin Sevcik

That's fascinating information, where did you find it? The RoboRIO specs that I looked at when formulating my answers stated 5.25V max for the logic high of the DIOs, with no mention of a max voltage. The analog IO is listed as +-16V protection, but there's no reason to assume that carries over to the DIO.

During Alpha testing, NI covered some design info. They talked about the protections they were incorporating and I remember them talking about the protections incorporated. I've got an Alpha Rio lying around I can attach a battery directly tonight to demonstrate (if I'm wrong and it fries, I won't care).