PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
Question
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Chapter 10, Problem 2P
Program Plan Intro

Counter:

  • Counter is a device used to store a particular event has occurred various number of times.
  • There are two types of counter namely,
    • Down counters
      • Down counters are already set with some value.
      • It counts downwards from that value to zero.
      • When it reaches zero, it achieves change state.
    • Up counters
      • Up counters counts upwards from zero to some preset value.
      • When it reaches the preset value, it achieves change state.

Explanation of Solution

b.

Steps to operate the program to set Pilot Light 1 (PL1) output to “ON”:

  • Press the reset Push Button (PB) to reset the counter to zero.
  • To make a count of off-to-on transitions to 25, set the thumbwheel switch to a count of 025...

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