Programmable Logic Controllers - With Access
5th Edition
ISBN: 9781259933523
Author: Petruzella
Publisher: MCG
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Question
Chapter 7, Problem 8P
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).
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Chapter 7 Solutions
Programmable Logic Controllers - With Access
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - a. What are the two methods commonly used to...Ch. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - For a TOF timer: a. When is the enable bit of a...Ch. 7 - Explain what each of the following quantities...
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