Activities Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259679568
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
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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Design a ladder program to run the material mixing system according to the following
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1- When the start push button 10.0 is pressed, the pump (PUMP1 Q0.0) works for five
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2- After that, the pump (PUMP2 Q0.1) runs for three seconds and then stops.
3- After that the pump (Mixer Motor Q0.2) works for 60 sec and then stops.
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Design a ladder program to run the material mixing system according to the following
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seconds and then stops.
2- After that, the pump (PUMP2 Q0.1) runs for three seconds and then stops.
3- After that the pump (Mixer Motor Q0.2) works for 60 sec and then stops.
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Chemical 1)
Pump 1
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(10.0)
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(00.2)
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Pump 3
(904)
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is closed, the first motor runs and
when the ignition is opened
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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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