Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 13, Problem 22RQ
Program Plan Intro

Watchdog timer circuit:

  • Watchdog timer circuit refers to a separate timing circuit.
  • The processor must set as well as reset the watchdog timer within a predetermined period.
  • It is used by the Programmable Logic Controller (PLC’s) to monitor the scanning process of the system.

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