Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 10, Problem 3P
Program Plan Intro

Timer:

  • Timer is special type of clock used to measure some specific time intervals.
  • Three types of timer
    • Delay-OFF Timer
      • Delay-OFF timer is activated when it is turned on and does not wait for the entry of input.
      • It is used to count downwards from the programmed time.
      • The value of timer is cleared when the enabling input is in off state.
    • Delay-ON Timer
      • Delay-ON timer is activated by its input.
      • It is used to count upwards to the programmed time.
      • The value of timer is cleared when the enabling input is in off state.
    • Delay-ON-Retentive Timer
      • Delay-ON-Retentive Timer is activated by the inputs and starts accumulating time.
      • It retains the accumulated value even if the rung goes false.
      • It can be reset only by RESET command.

Thumbwheel switch:

  • Thumbwheel switch is a switch which is used to convert numerical values displayed on disk where the numbers are converted into binary, decimal and hexadecimal values.
  • It contains a function called lock which helps to retain the preset value from being modified.
  • It can be operated only by a thin object like pen tip.

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