PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Question
Chapter 7, Problem 8RQ
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.
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 time delay (instruction goes from OFF to ON state).
Explanation of Solution
b.
Timer-timing bit of a timer instruction:
- When the accumulated value of a timer changes, the timer-timing bit becomes true.
- The accumulated value refers to the current delay of the timer.
- The timer instruction becomes true when the control line of the timer is energized by the power s...
Explanation of Solution
c.
Done bit of a timer:
- The accumulated value refers to the current delay of the timer.
- The preset value refers to the delay period of the timer...
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Chapter 7 Solutions
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
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...
Ch. 7 - State the method used to reset the accumulated...Ch. 7 - Study the ladder logic program in Figure 7-40 and...Ch. 7 - Study the ladder logic program in Figure 7-42, and...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 13PCh. 7 - When the lights are turned off in a building, an...
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