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)
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Chapter 4, Problem 3P
Program Plan Intro

Logic gate:

  • Logic gate is an electronic circuit that is used to perform logic decisions based on the input.
  • It contains one or more number of inputs and one output.
  • The working of logic gate is based on the binary principle that has two states either logic 0 or logic 1.
  • The output of logic gate is produced when it satisfies any of its logic conditions.
  • The logic condition depends upon the type of the gates and the number of inputs.
  • The primary logic gates include AND, OR, and NOT. The combinations of these gates are used to implement any of the other logic gates.

AND gate:

  • The AND gate refers to a logic gate whose output will be HIGH only when all the inputs are HIGH.
  • The output of AND gate will be LOW when any one of its input will be LOW.
  • The symbol to represent AND gate is given below:

Activities Manual For Programmable Logic Controllers, Chapter 4, Problem 3P , additional homework tip  1

  • The truth table for AND gate is as follows:
INPUT AINPUT BOUTPUT Y
000
010
100
111

NOR gate:

  • NOR gate performs the inverse operation of OR gate.
  • The NOR gate refers to a logic gate whose output will be HIGH only when all the inputs are LOW.
  • The output of NOR gate will be LOW when any one of its input will be HIGH.
  • The symbol to represent NOR gate is given below:

Activities Manual For Programmable Logic Controllers, Chapter 4, Problem 3P , additional homework tip  2

  • The truth table for NOR gate is as follows:
INPUT AINPUT BOUTPUT Y
001
010
100
110

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