Deck 1: What Is a Programmable Logic Controller PLC

Question 1

The number of input and output modules necessary is dictated by the requirements of the equipment that is to be controlled by a PLC.

Answer 1

True

Question 2

The reluctance of the end user to learn a new language and the advent of the microprocessor gave the industry what is now known as the ____________________.

Answer 2

programmable logic controller (PLC),programmable logic controller,PLC

Question 3

What determines the size, or amerage rating of a power supply?

Answer 3

The size or amperage rating of the power supply is based on the size, number, and type of I/O modules that are to be used.

Question 4

Even though the electromechanical relay has served well for many generations, the ever-increasing sophistication and complexity of modern processing equipment requires faster acting, more reliable control functions than electromechanical relays and/or timing devices can offer.

Question 5

____________________ is a high-level, real-world, graphic language that is understood by most electricians and technicians.

Question 6

List two terms that are used to describe an I/O device.

Question 7

A typical PLC can be divided into three components consisting of the processor unit, the power supply, and the programming device.

Question 8

A(n) ____________________ is used to program most of the PLCs on the market today.

Question 9

The term ____________________ is used to distinguish actual devices that exist and must be physically wired from the internal functions of the PLC system that duplicate the function of relays, timers, counters, and so on, even though none physically exists.

Question 10

What does the step-down transformer do?

Question 11

Analog I/O devices are either ON or OFF, open or closed.

Question 12

Describe when an interface occurs.

Question 13

The I/O section also converts varying voltage or current signals from analog input devices into corresponding decimal values by way of a(n) ____________________.

Question 14

PLCs are designed to be operated by plant engineers and maintenance personnel with limited knowledge of computers.

Question 15

What is a programmable logic controller?