Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 1, Problem 14RQ
Explanation of Solution
Changing the process control operation in a relay-based system::
- • Instead of using a relay based system, the process control operation is more reliable and easy to process using a PLC based system.
- • In a relay system, whenever there is a change in the input field, there must be a change in the rewiring of input devices,
- • This input device may be temperature switches, pressure switches, or manual push buttons...
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Chapter 1 Solutions
Programmable Logic Controllers
Ch. 1 - Prob. 1RQCh. 1 - Identify four tasks in addition to relay switching...Ch. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Prob. 5RQCh. 1 - Prob. 6RQCh. 1 - Explain the main function of each of the following...Ch. 1 - What are the two most common types of PLC...Ch. 1 - Prob. 9RQCh. 1 - Prob. 10RQ
Ch. 1 - Answer the following with reference to the process...Ch. 1 - Prob. 12RQCh. 1 - Answer the following with reference to the process...Ch. 1 - Prob. 14RQCh. 1 - Compare the PLC and PC with regard to: a. Physical...Ch. 1 - Prob. 16RQCh. 1 - Prob. 17RQCh. 1 - Prob. 18RQCh. 1 - Prob. 19RQCh. 1 - Prob. 20RQCh. 1 - List five factors affecting the memory size needed...Ch. 1 - Prob. 22RQCh. 1 - Given two single-pole switches, write a program...Ch. 1 - Given two single-pole switches, write a program...Ch. 1 - Prob. 3PCh. 1 - Prob. 4PCh. 1 - Prob. 5P
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- 1- Write a PLC ladder program to implement the process illustrated in Figure. 2- Indicate all the input and output field devices in their un-actuated conditions with symbolic addresses. The sequence of operation requires that: A start/stop pushbutton station is used to start and When the process starts, the tank is empty and solenoid A energizes to start filling the tank with liquid. As the tank fills, the Empty sensor switch closes. When the tank is half full, the Mid-full level sensor switch closes and the motor starts running to mix the liquid. When the tank is full, the Full level sensor switch closes momentarily so that: stop the process. a- The motor stops. b- Solenoid A is de-energized. c- Solenoid B is energized to empty the tank. When the tank is completely empty, the Empty sensor switch opens to de-energize solenoid B. The start button is pressed to repeat the sequence. out Puts SOL A oulput Motor Infut Full level sensor switch Mid-Full level Empty sensor sensor switch switch…arrow_forward1- Write a PLC ladder program to implement the process illustrated in Figure. 2- Indicate all the input and output field devices in their un-actuated conditions with symbolic addresses. The sequence of operation requires that: Normally open start push button and normally closed stop push button station is used to start and stop the process. When the process starts, the tank is empty and solenoid A energizes to start filling the tank with liquid. As the tank fills, the Empty sensor switch closes. When the tank is half full, the Mid-full level sensor switch closes and the motor starts running to mix the liquid. When the tank is full, the Full level sensor switch closes momentarily so that: a- The motor stops. b- Solenoid A is de-energized. c- Solenoid B is energized to empty the tank. When the tank is completely empty, the Empty sensor switch opens to de-energize solenoid B. The start button is pressed to repeat the sequence. SOL A Motor Full level sensor switch Mid-Full level sensor…arrow_forward1- Write a PLC ladder program to implement the process illustrated in Figure. 2- Indicate all the input and output field devices in their un-actuated conditions with symbolic addresses. The sequence of operation requires that: Normally open start push button and normally closed stop push button station is used to start and stop the process. When the process starts, the tank is empty and solenoid A energizes to start filling the tank with liquid. As the tank fills, the Empty sensor switch closes. When the tank is half full, the Mid-full level sensor switch closes and the motor starts running to mix the liquid. When the tank is full, the Full level sensor switch closes momentarily so that: a- The motor stops. b- Solenoid A is de-energized. c- Solenoid B is energized to empty the tank. When the tank is completely empty, the Empty sensor switch opens to de-energize solenoid B. The start button is pressed to repeat the sequence. SOL A Motor Full level sensor switch Mid-Full level sensor…arrow_forward
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