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 6, Problem 2P
Program Plan Intro

Break-make pushbutton switch:

  • Break-before-make pushbutton is a switch whose top level section contacts are Normally Closed (NC) and bottom level section contacts are Normally Open (NO).
  • The top level contacts will be opened before the bottom level contacts get closed when the pushbutton is pressed.
  • An electrical symbol used to represent break-make pushbutton switch is given below.

Activities Manual for Programmable Logic Controllers, Chapter 6, Problem 2P

Given:

The conventional hardwired relay circuit should perform the following circuit functions when two break-make pushbuttons are used.

  • The light L1 must turn ON when pushbutton PB1 is pressed.
  • The light L2 must turn ON when pushbutton PB2 is pressed.
  • The pushbuttons must be interlocked electrically, such that L1 and L2 cannot be turned ON simultaneously.

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