Package: Programmable Logic Controllers with Activities Manual
Package: Programmable Logic Controllers with Activities Manual
5th Edition
ISBN: 9781259717550
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 5, Problem 21RQ
Program Plan Intro

NO limit switch:

  • Normally Open (NO) limit switch refers to a commonly used industrial control device.
  • It is used to operate when a predetermined limit is reached.
  • It is actuated by contact with an object such as a cam.
  • An electrical symbol used to represent NO limit switch is given below

Package: Programmable Logic Controllers with Activities Manual, Chapter 5, Problem 21RQ

Solenoid:

  • The working of solenoid is based on the principle of magnetic induction.
  • It contains a coil, frame, and a plunger known as armature.
  • The main function of solenoid is to convert electrical signals into mechanical motion.
  • Due to its magnetic movement, solenoid is used in different areas such as locking of two devices, interlocking of gear wheel in automobiles and some other medical application.

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