PLC: Sensors and I/O Series--General Sensors

Part 1 of the Sensors and I/O Series explains different types of sensors and what they sense.


  • Explain many types of sensors and what they sense (prox, capacitance, temp, current, photo)

  • Young lady at dental firm said plc is stupid without sensors.

  • I have seen catalogs form vendors with 1000’s of different photo eyes

  • Some sensors will be two wires, some three and four wire.

  • Mainly Three different types of outputs: Digital (solid state – or relay) – analog and serial

  • Watch specific videos on the three types.

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