[SousVide]

So, the problem that we've always have is having the limit-switches wired in a way that is failsafe. If the mechanism or action that the limit-switch is meant to stop is one that could be destructive or harmful, then if somehow the limit-switch itself fails or the wiring connecting it to the RoboRio fails (cut or is disconnected), the software won't read this limit condition and the destructive process will proceed... In this case, we like to use limit-switch that are wired as NC (and open when contact is made)... that way, if there's a failure in the limit-switch (or the wiring) it stops the mechanism from working altogether.

I don't think there's a way for a NO limit-switch to be fixed in software to detect a limit-switch failure scenario. It would look like everything is fine until when it's suppose to signal the contact.