PROGRAMMABLE LOGIC CONTROLLERS-PACKAGE
PROGRAMMABLE LOGIC CONTROLLERS-PACKAGE
5th Edition
ISBN: 9781260017502
Author: Petruzella
Publisher: MCG
Expert Solution & Answer
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Chapter 5, Problem 2P

Explanation of Solution

Diagram using an interposing relay:

The given program is redrawn to solve the problem of a nested contact as shown below.

Explanation:

  • In the above given ladder program, there are mainly three possible continuity paths to turn ON the output Y.
  • The paths may be through the contact switches A and B, or C and D or E and D...

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