Programmable Logic Controller (PLC) Questions and Answers – 16

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AB Programmable Logic Controller (PLC) Questions and Answers

Suppose we have an Allen-Bradley MicroLogix 1000 controller connected to three pushbutton switches as shown in this illustration:

Allen-Bradley MicroLogix controller

Determine the necessary switch actuation statuses (i.e. pressed versus unpressed) to turn the blue lamp on, given the following program running in the PLC:

Allen-Bradley MicroLogix controller ladder logic

Answer :

  • Switch A = pressed
  • Switch B = released
  • Switch C = pressed

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Credits :  Tony R. Kuphaldt – under CC BY 1.0

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