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NO and NC (Normally Open and Normally Closed) Proximity Sensor Basics

When I was learning PLC programming, I remember scratching my head about some of the concepts surrounding proximity sensors. Digital or analog, Normally Open (NO or N.O.), or Normally Closed (NC or N.C.)?  What exactly does it mean for a sensor to be NO or NC? What effect will it have when I’m checking the […]

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