Technicians Guide to Programmable Controllers, 7e

Technician's Guide to Programmable Controllers, 7e Terry Borden, Richard Cox (Instructor Manual, All Chapters. 100% Original Verified, A+ Grade) 1 / 4

Instructor Manual: Terry Borden and Richard Cox, Technician’s Guide to Programmable Controllers, 2023, 9780357622490;

Chapter 1: What is a Programmable Logic Controller (PLC)?

1 © 2023 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.Instructor Manual Terry Borden and Richard Cox, Technician’s Guide to Programmable Controllers, 2023, 9780357622490;

Chapter 1: What is a Programmable Logic Controller (PLC)?

Table of Contents Purpose and Perspective of the Chapter ..................................................................................... 2 Chapter Objectives ........................................................................................................................ 2 What’s New in This Chapter .......................................................................................................... 2 Review Questions .......................................................................................................................... 2 Answers to Review Questions ...................................................................................................... 3 2 / 4

Instructor Manual: Terry Borden and Richard Cox, Technician’s Guide to Programmable Controllers, 2023, 9780357622490;

Chapter 1: What is a Programmable Logic Controller (PLC)?

2 © 2023 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.Purpose and Perspective of the Chapter The purpose of this chapter is to give students a general overview of what a programmable logic controller (PLC) is and how it differs from a computer. This chapter provides the student with an overview of the major hardware components that make up a PLC system.In addition, students will receive an introduction into the input and output (I/O) section of a PLC and the common terms used to describe the various types of inputs and outputs.Chapter Objectives

The following objectives are addressed in this chapter:

1.Describe several advantages of a programmable logic controller (PLC) over hardwired relay systems.

2.Identify the four major components of a typical PLC.

3.Describe the function of the four major components of a typical PLC.

4.Define the acronyms PLC, CPU, PC, I/O, ADC, and DAC.

5.Define the term discrete.

6.Define the term analog.What’s New in This Chapter The following elements are improvements in this chapter from the previous edition: •Updated with all new color figures and images •Updated with latest PLC hardware Review Questions 1.List the four main components of a programmable logic controller.

2.Define the term interface.

3.Define the term real world.

4.Define the term discrete.

5.What do the following acronyms stand for?

CPU ADC PC

I/O DAC PLC

6.Define the term analog. 3 / 4

Instructor Manual: Terry Borden and Richard Cox, Technician’s Guide to Programmable Controllers, 2023, 9780357622490;

Chapter 1: What is a Programmable Logic Controller (PLC)?

3 © 2023 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

• What is typically used to program and monitor PLCs?
• Relay Ladder Logic is a high-level graphic computer language.

T F

• What is the major advantage of a PLC system over the traditional hardwired control

system?Answers to Review Questions

• Processor unit, power supply, input/output section, and programming device.
• An interface occurs when two systems come together and interact, or communicate.
• An actual device that exists and must be physically wired.
• Discrete I/O devices have only two states either ON or OFF, OPEN or CLOSED. For

example, push button, limit switch, pilot light, etc.

• CPU—central processor unit; PLC—programmable logic controller; ADC—analog-to-

digital converter; DAC—digital-to-analog converter; PC—personal computer; I/O- input/output.

• Analog devices have an infinite number of possible values, not just ON or OFF. Analog is

a continuous signal that depends directly on magnitude (voltage or current) to represent some condition. For example, temperature, pressure, level, etc.

• Personal computer (PC)
• True
• Reliability, flexibility, and speed.
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