PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
5th Edition
ISBN: 9781266481475
Author: Petruzella
Publisher: MCG
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Chapter 10, Problem 3RQ
Program Plan Intro

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.

Data manipulation instructions:

  • Data manipulation instructions enable the numerical data that exists in the controller’s memory to be performed within the control program.
  • Data manipulation instructions allows manipulation of data that is stored in either single or multiple words groups.
  • It also includes the transfer of data from one data memory area of the PLC to another.
  • In order to accomplish data manipulation, there are mainly two different kinds of instructions.
    • Instructions which operate on word data.
    • Instructions which operate on file or block.
  • It also provides great flexibility to program control circuits.

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