EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
5th Edition
ISBN: 8220102803503
Author: Petruzella
Publisher: YUZU
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Chapter 7, Problem 13P
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 a Delay-OFF, a Delay-ON, and a Delay-ON-Retentive timer.

Timer OFF Delay (TOF):

  • TOF refers to an off-delay timer.
  • TOF counts the time-based intervals as soon as the instruction becomes false.
  • Here, the output changes its state from high to low when the timer provides some time delay (instruction goes from ON to OFF state).

Given:

In the given figure, the tags are formed for various areas of controller for various purposes.

  • The two push buttons are used to start and stop the process.
  • The highest level of the tank is indicated by the full level sensor switch. Here, when the tank level is full, the switch gets closed.
  • The empty level of the tank is indicated by the empty level sensor switch. Here, when the tank starts the filling process, the switch gets closed.
  • The “Solenoid A” is used to de-energize (it means to fill) the tank.
  • The “Solenoid B” is used to energize (it means to empty) the tank.

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