Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 7, Problem 7RQ
Program Plan Intro
Programmable Logic Controller (PLC):
- Programmable Logic Controller (PLC) is a specialized computer used in industrial segments to control machines and process.
- PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
- The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
- When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
- The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by control
programming language.
Timer:
- A timer refers to an instruction which waits for an amount of time before performing something.
- A timer counts fractions of seconds or seconds using the internal CPU clock.
- There are mainly three types of PLC timer delays, such as ON-delay timer, OFF-delay timer, and retentive timer ON.
- The main purpose of mechanical timing relays is to delay the opening and closing of contacts for circuit control.
- Its operation is almost similar to that of a control relay.
- The only difference is that the contacts of a mechanical timing relay are used to operate at a preset time interval, that is, after the coil is energized or de-energized.
- One example for mechanical timing relay is Pneumatic timing relay.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
What is the significance of a watchdog timer in a microcontroller system?
Create a PLC ladder logic diagram for an alarm that turns on when either A counts up to 10, or B counts down to 7.
How does Clock Prescaling work in microcontroller timer modules?
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...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.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_forwardPLCs use two basic types of instructions: contacts coilsDifferentiate the two types of instruction.arrow_forwardA traffic light PLC program working with a screen will be installed. We will enter and adjust the intervals on the screen. (Red, green and yellow light flashing times). Put the every step's picture please.arrow_forward
- Describe all the different modes of operation in Programmable Interval Timer 8254 with its timing diagram. Note: subject= microprocessorarrow_forwardDraw a ladder logic diagram for the timer scenario shown.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
- Q3: 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_forwardPLC programming Draw or write a ladder plc diagr for 3 proximity sensor. The proximity sensor is position right and left and 1 in front.arrow_forwardConsider the following T flip flop timing diagram: What type of clock trigger is used? Clk Q No Correct answer Falling Edge Trigger Rising Edge Trigger Falling and Risingarrow_forward
- Compare between synchronous and asynchronous counterarrow_forwardDraw a ladder diagram in PLC programming for manually operated standing A+B+B-A- cylinder sequence.arrow_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
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education