Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
Question
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Chapter 15.4, Problem 4RQ
Program Plan Intro

Counter:

  • It is similar to the timer concept.
  • It is used to count the changes that are produced by the state of an outside trigger signal.
  • It is a programmable logic controller (PLC) instruction that either counts up or counts down an integer value when produced by the change of a bit from “0” to “1” or “false” to “true”.
  • In PLC, counter contains three types.
    • Up counters.
    • Down counters.
    • Up/Down counters.

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Chapter 15 Solutions

Programmable Logic Controllers

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