Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 13, Problem 25RQ
Program Plan Intro

Programmable Logic Controller (PLC):

  • Programmable Logic Controller (PLC) is a specialized computer used in industrial segments to control machines and process.
  • PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
  • The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
  • When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
  • The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by controlling programming language.

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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