Activities Manual for Programmable Logic Controllers
Activities Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259679568
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 8, Problem 7RQ
Program Plan Intro

a.

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 control programming language.

PLC counter:

  • A counter is a PLC instruction which counts up or down when the input transfers from an off state (false) to an on state (true).
  • The three different types of counters instructions are as follows:
    • Up counter
    • Down counter
    • Combined counter

Program Plan Intro

b.

PLC counter:

  • A counter is a PLC instruction which counts up or down when the input transfers from an off state (false) to an on state (true).
  • The three different types of counters instructions are as follows:
    • Up counter
    • Down counter
    • Combined counter

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7. Character AnalysisIf you have downloaded the source code you will find a file named text.txt in the Chapter 08 folder. Write a program that reads the file’s contents and determines the following: The number of uppercase letters in the file The number of lowercase letters in the file The number of digits in the file The number of whitespace characters in the file
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