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 9P

Write the ladder logic program needed to implement each of the following (assume inputs A, B, and C are all normally open toggle switches):

  1. a. When input A is closed, turn ON and hold ON outputs X and Y until A opens.
  2. b. When input A is closed and either input B or C is open, turn ON output Y; otherwise, it should be OFF.
  3. c. When input A is closed or open, turn ON output Y.
  4. d. When input A is closed, turn ON output X and turn OFF output Y.
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