I am going to shopaholic a bunch of proximity sensors to replace mechanical homing and limit switches for two machines with Mesa cards (5i25/7i77) and then it struck me, what is the best option? NPN or PNP? How do they behave if there's no power to them or if they fail? For example a PNP NO, is it open all the time or only open if the drive circuit has power? What I am trying to grasp is what type of switch I should use to trust the machine even if the switch fails (broken switch no operation).
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