Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 7, Problem 10RQ
Explain what each of the following quantities associated with a PLC timer instruction represents:
- a. Preset time
- b. Accumulated time
- c. Time base
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Chapter 7 Solutions
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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Similar questions
- Is logical outputs that can often be powered directly from PLC output boards Motor Starters O Servo Motors O Lights O Switches Oarrow_forwardCreate a PLC ladder logic diagram for an alarm that turns on when either A counts up to 10, or B counts down to 7.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.arrow_forward
- 8- ...... can be connected to the analog ****** input of the PLC.* O Level switches Ph O Flow switches Pushbutton switches Selector switchesarrow_forwardWrite the program instructions corresponding to the program in the figure and state the results of inputs to the PLC. Y430 X400 M100 Y430 M100 X401arrow_forward3. In modular PLC I/O is divided into compartments which separated modules can be plugged to A. Decrease the error ratio B. Decrease the cost C. Increase the efficiency D. Increase the flexibility of operationarrow_forward
- 5. The most common type of I/O interface module in PLC is the discrete type, such as A. Thermocouples, strain gages, or pressure sensors B. Selector switches, pushbuttons, and limit switches C. servomotors, stepping motors PID loops, and decoder inputs D. multiplexed displays, and keyboardsarrow_forwardPLCs use two basic types of instructions: contacts coilsDifferentiate the two types of instruction.arrow_forwardDescribe all the different modes of operation in Programmable Interval Timer 8254 with its timing diagram. Note: subject= microprocessorarrow_forward
- 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: 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. Create a Ladder logic using below instruction -Function: A start, and a stop button is used for starting and stopping a motor. But makesure that the buttons can only start and stop the motor on a positive or rising edge.2. Briefly explain how the traffic light are working using PLC Program for Traffic LightControl. Include a diagram to your explanation.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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