PROGRAMMABLE LOGIC CONTROLLERS-PACKAGE
PROGRAMMABLE LOGIC CONTROLLERS-PACKAGE
5th Edition
ISBN: 9781260017502
Author: Petruzella
Publisher: MCG
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Textbook Question
Chapter 1, Problem 11RQ

Answer the following with reference to the process control relay ladder diagram of Figure 1-17 of this chapter:

  1. a. When do the pressure switch contacts close?
  2. b. When do the temperature switch contacts close?
  3. c. How are the pressure and temperature switches connected with respect to each other?
  4. d. Describe the two conditions under which the motor starter coil will become energized.
  5. e. What is the approximate value of the voltage drop across each of the following when their contacts are open?
  6. (1) Pressure switch
  7. (2) Temperature switch
  8. (3) Manual pushbutton
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  • Design a finite state machine to control a device which consists of five sensors lined up in a row, controlled by the finite state machine’s outputs Zero, One, Two, Three, and Four. The five sensors scan an area outside a building. Each sensor scans one part of that area. When the sensor’s output is one, it is scanning its area, and when the sensor’s output is zero, it is not scanning its area. Only one sensor is on at a time meaning that each sensor takes a turn at being the sensor that is currently on. This turn taking follows a backand-forth motion going from left to right and then going from right to left. It is this “motion” that the finite state machine controls. The clock speed (which you do not need to know) regulates the rate of the motion. There are no inputs for the finite state machine.
    Design a finite state machine to control a device which consists of five sensors lined up in a row, controlled by the finite state machine’s outputs Zero, One, Two, Three, and Four. The five sensors scan an area outside a building. Each sensor scans one part of that area. When the sensor’s output is one, it is scanning its area, and when the sensor’s output is zero, it is not scanning its area. Only one sensor is on at a time meaning that each sensor takes a turn at being the sensor that is currently on. This turn taking follows a backand-forth motion going from left to right and then going from right to left. It is this “motion” that the finite state machine controls. The clock speed (which you do not need to know) regulates the rate of the motion. There are no inputs for the finite state machine. a. Draw the State Diagram for the controller b. Then, name the states of the controller and assign state numbers to the states in the state mapping table. c.Then, use the state mapping table…
    Design a finite state machine to control a device which consists of five sensors lined up in a row, controlled by the finite state machine’s outputs Zero, One, Two, Three, and Four. The five sensors scan an area outside a building. Each sensor scans one part of that area. When the sensor’s output is one, it is scanning its area, and when the sensor’s output is zero, it is not scanning its area. Only one sensor is on at a time meaning that each sensor takes a turn at being the sensor that is currently on. This turn taking follows a backand-forth motion going from left to right and then going from right to left. It is this “motion” that the finite state machine controls. The clock speed (which you do not need to know) regulates the rate of the motion. There are no inputs for the finite state machine. a. Draw the State Diagram for the controller
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