PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
5th Edition
ISBN: 9781266481475
Author: Petruzella
Publisher: MCG
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Chapter 7, Problem 7P
Program Plan Intro

Timer:

  • Timer is mainly used to keep an output ON for a specific length of time.
  • It provides a preset delay to the control actions.
  • In a timer, the output will be energized when the preset value becomes equal to the accumulated value.
  • Three different types of timers include Delay-OFF timer, Delay-ON timer and Delay-ON-Retentive timer.

Retentive Timer On (RTO):

  • RTO refers to an on-delay timer.
  • RTO counts the time-based intervals as soon as the instruction becomes true.
  • It retains the accumulated value as soon as instruction goes false or when power cycle occurs.

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