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Programmable Logic Controller (PLC) Questions and Answers – 7

Programmable Logic Controller (PLC) Questions and Answers 

Suppose we have a PLC connected to three pushbutton switches as shown in this illustration:

PLC Questions - 1

X1 to X4 : Digital Inputs

Y1 to Y4 : Digital Outputs

Determine the switch actuation statuses (i.e. pressed versus released) given the “live” display of the ladder logic program shown here:

PLC Ladder Logic for Push button

Answer :

Necessary switch statuses:

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

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Credits : by Tony R. Kuphaldt – under CC BY 1.0

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1 comment

SR January 24, 2021 at 1:09 pm

problem # 7:

“Determine the switch actuation statuses (i.e. pressed versus released) given the “live” display of the ladder logic program shown here:”

The correct answer should be
Switch A = pressed
Switch B = pressed
Switch C = released

If your question asked to provide the appropriate push button states to turn lamp Y1 on, then your answer would have been correct (unless I am overlooking something that I did not catch)

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Programmable Logic Controller (PLC) Questions and Answers - 7

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