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)
Question
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Chapter 9, Problem 8RQ
Program Plan Intro

a.

Programmable Logic Controller (PLC):

  • 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.

Explanation of Solution

b.

Practical uses for forcing functions:

  • The force functions available in PLCs are used to accomplish forcing.
  • Force function refers to a manual control function that is capable of overriding the current status of I/O from keyboard...

Explanation of Solution

c.

Need to exercise extreme care:

  • Extreme care must be taken while using forcing function because incorrect usage of forcing functions can cause damage to both equipment and people surrounding the equipment...

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