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Inst Tools > Blog > Practical Questions > Programmable Logic Controller (PLC) Questions and Answers – 1

Programmable Logic Controller (PLC) Questions and Answers – 1

Last updated: June 6, 2018 10:07 am
Editorial Staff
Practical Questions
4 Comments
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Suppose we have a PLC connected to three pushbutton switches as shown in this illustration:

PLC Questions - 1

In the above diagram :

  • 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 Switch Logic

Also, determine the status of the lamp connected to the PLC’s Y1 output.

Answer :

Switch statuses:

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

The lamp will be de-energized.

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Credits :  Tony R. Kuphaldt – under CC BY 1.0

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4 Comments
  • jairo francisco says:
    October 23, 2017 at 1:27 pm

    A lampada só acenderar se A e C for prenssionados juntos

    Translated : The lamp only glow if A and C together is present.

    Reply
  • ali alghasham says:
    June 12, 2018 at 8:39 am

    thank you

    Reply
  • Hitesh says:
    December 31, 2018 at 12:50 pm

    The lamp only glow without any action on pushbutton means exiting field wiring and logic instruction condition is true when power on

    Reply
  • Sundar Ganesh V says:
    June 13, 2024 at 9:15 pm

    As per the ABC switch status,
    Status A- NO Switch – In logic it is NC – Enabled state
    Staus B – NC Switch – In Logic it is NO – Enabled State
    Status C – NO switch – in logic it is NC – Enabled state
    Therefore, Output(Y1) will glow until switch state change.

    Reply

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