Activities Manual For Programmable Logic Controllers
Activities Manual For Programmable Logic Controllers
5th Edition
ISBN: 9781259682476
Author: Frank Petruzella
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 6, Problem 1P
Program Plan Intro

NC pushbutton switch:

  • The abbreviation NC stands for a Normally Closed pushbutton switch.
  • It will be initially at closed contact and will be opened when the switch or coil is energized.
  • It opens a circuit when it is pressed and return back to its closed condition when it is released.
  • An electrical symbol used to represent NC pushbutton switch is given below

Activities Manual For Programmable Logic Controllers, Chapter 6, Problem 1P

Given:

The conventional hardwired relay circuit should perform the following circuit functions when a NC pushbutton is pressed.

  • The pilot light must be switched ON.
  • The solenoid must be de-energized.
  • Motor running should be started.
  • Sound a horn.

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