Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 7, Problem 5RQ
- a. What are the two methods commonly used to represent a timer instruction within a PLC’s ladder logic
program ? - b. Which method is preferred? Why?
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1. 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.
1. Briefly describe the difference between the different types of counter modules used for PLCs.
2. Design a ladder logic program for a traffic light intersection. Use timers to control the
duration of the green, yellow, and red lights for each direction.
.............Control loop is a continuous cycle of the PLC reading
Ladder Logic O
Outputs
Inputs O
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
- What is the difference between modes of operation (run,prog,rem)in plcarrow_forwardThe programs that can be used in PLC are Ladder logic, structured text O Instruction list, Functional block diagram O Sequential function chart O All of the above Oarrow_forwardWith the aid of Table-1 in the back of this exam paper, answer the following: a- Design the control signal and for the memory write operation. b- Draw the logic diagram of the control signal derived in (a).arrow_forward
- 3- Draw the PLC ladder logic of the following: X = ((A · B · C) + B) · B · (A + Ĉ) %3Darrow_forwardExplain the general structure of programmable controllers (PLC) by drawing figures. Write the names of the control elements to be connected to the input and output parts of the PLC. (Please type with keyboard so that I can understand.Thanks)arrow_forwardExplain the general structure of programmable controllers (PLC) by drawing figures. Write the names of the control elements to be connected to the input and output parts of the PLC.arrow_forward
- Draw a PLC ladder logic program that will control a motor in two different directionsarrow_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_forwardDesign a PLC program and prepare a typical I/O connection diagram and ladder logic program for the following motor control specifications: • Three starters are to be wired so that each starter is operated from its own start/stop pushbutton station. • A master stop station is to be included that will trip out all starters when pushed.arrow_forward
- Describe all the different modes of operation in Programmable Interval Timer 8254 with its timing diagram. Note: subject= microprocessorarrow_forwardQ3: Design an asynchronous counter that divides the input clock signal by 5 then draw counter's logic circuit and its corresponding timing diagram for 10 clock pulses. Duararrow_forward5. 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_forward
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