Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
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Chapter 7, Problem 9P
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 ON Delay (TON):

  • TON refers to an on-delay timer.
  • The on-delay timer is the most commonly used timer.
  • TON counts the time-based intervals as soon as the instruction becomes true.
  • Here, the output changes its state from low to high when the timer provides some time delay (instruction goes from OFF to ON state).

Explanation of Solution

b.

Given:

Consider the given conditions,

  • Input = True
  • EN = 1
  • TT = 1
  • DN = 1

Explanation:

The given program uses TON, so if the input is true, then the instruction will start to execute the program.

  • The timer “T4:0” will start timing and the EN signal bits get activated.
  • Next, the TT also turns into “true” until the accumulated values attains the preset value “10”...

Explanation of Solution

c.

Given:

Consider the given conditions,

  • Input = False
  • EN = 0
  • TT = 0
  • DN = 0

Explanation:

  • The given program uses TON, so if the input is true, then the instruction will start to execute the program...

Explanation of Solution

d.

Given:

Consider the given conditions,

  • Input = True
  • EN = 1
  • TT = 0
  • DN = 1

Explanation:

The given program uses TON, so if the input is true, then the instruction will start to execute the program.

  • The timer “T4:0” will start timing and the EN signal bits get activated...

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