Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
Textbook Question
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Chapter 5, Problem 1RQ

What does the memory map for a typical PLC processor consist of?

Expert Solution & Answer
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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 programmable 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 run by control programming language.

Explanation of Solution

Memory map for a PLC processor:

  • The memory map for a typical PLC processor includes different sections such that each section is allotted to its specific operations.
  • The main sections of PLC such as Allen-Brandley includes rack based memory map and tag based memory map.
  • Based on the sections of PLC divisions, the organization comes into picture.
  • The memory space in each and every section is split into two different categories such as memory space for program files and memory space for data files.

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