Lecture 3 From Page 29

Question 1

To distinguish the BCD numbering system from a binary system, a BCD designation is placed to the right of the units

Answer 1

digit

Question 2

A thumbwheel switch is an input device that makes use of the

Answer 2

BCD numbering system

Question 3

The input module attached to the thumbwheel has one connection for each

Answer 3

bit’s weighted value

Question 4

Many PLCs allow you to change the format of the data that the data monitor

Answer 4

displays

Question 5

The Gray code is set up so that as we progress from one number to the next, only one bit

Answer 5

changes.

Question 6

Gray codes are used with position encoders for accurate control of the motion of robots, machine tools, and

Answer 6

servomechanisms

Question 7

Optical encoder disk that uses a

Answer 7

4-bit Gray code

Question 8

The encoder disk is attached to a rotating shaft and outputs a digital Gray code signal that is used to determine

Answer 8

the position of the shaft

Question 9

ASCII stands for American Standard Code for

Answer 9

Information Interchange

Question 10

The keystrokes on the keyboard of a computer are converted directly into ASCII for processing by the

Answer 10

computer