Activities Manual For Programmable Logic Controllers
5th Edition
ISBN: 9781259682476
Author: Frank Petruzella
Publisher: Mcgraw-hill Higher Education (us)
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Question
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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Chapter 7 Solutions
Activities Manual For Programmable Logic Controllers
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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