Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 12, Problem 3RQ
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.

Sequencers:

  • Programmable Logic Controller (PLC) sequencer performs ON or OFF output patterns using sequencer instructions.
  • The sequencer output instruction is used for controlling the output devices.
  • PLC sequencer instructions are used for controlling machines which provides a stepped sequence of repeatable operations.
  • It simplifies the ladder program by allowing the user to use a single or pair of instructions for performing complex operations.
  • Various sequencer instructions can be programmed based on the PLC manufacturer.

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