PLC'S Chapter 3

Question 1

What is the Decimal system?

Answer 1

It is the most common to us, has a base of 10. The radix or base of a number system determines the total number of different symbols or digits used by that system.

Question 2

What is the Binary System?

Answer 2

Binary System-

Uses the number two as the base. The only allowable digits are 0 and 1.

Question 3

Each ___ is capable of storing data in the form of binary digits, or bits.

Answer 3

Word

Question 4

The number of ___ that a ___ can store depends on the type of PLC system used.

Answer 4

Bits, word

Question 5

PLC memory is organized using ___, ____, or ____

Answer 5

Bytes,single words,or double words

Question 6

A group of __ bits is a byte. And a group of 2 or more bytes is a ___.

Answer 6

8,word

Question 7

To convert a decimal number to its binary equivalent we must perform a series of division by ___.

Answer 7

2

Question 8

Computer memory is a series of binary __’s and __’s.

Answer 8

1’s and 0’s

Question 9

One method of representing a binary number as either a ____ or ____ value to use and extra digit or ____ at the MSB side of the number.

Answer 9

Positive, negative, or sign bit

Question 10

The ___________ is a base 8 system, is used because 8 data bits make up a byte of information that can be addressed.

Answer 10

The Octal Numbering System

Question 11

What is a convenient means of handling large binary numbers.

Answer 11

The Octal Numbering System

Question 12

_____ converts easily to _____ equivalents.

Answer 12

Octal, binary

Question 13

________________ is a numbering system is used in programmable controllers because a _____ of data consists of ___ data bits, or _________ bytes.

Answer 13

___The Hexadecimal Numbering System_ is a numbering system is used in programmable controllers because a ___word__ of data consists of __16_ data bits, or _____two 8-bit____ bytes.

Question 14

The Binary Coded Decimal System (BCD) provides a ______way of handling _______ that need to be ________or _______ from a PLC.

Answer 14

The Binary Coded Decimal System (BCD) provides a ____convenient__way of handling ___large numbers____ that need to be ___input_____or ______output_ from a PLC.

Question 15

______ stands for American Standard Code for Information Interchange.

Answer 15

ASCII

Question 16

What is an alphanumeric code because it includes letters as well as numbers.

Answer 16

ASCII

Question 17

A ____ bit is used to detect errors that may occur while a ___ is moved.

Answer 17

A _parity___ bit is used to detect errors that may occur while a _word__ is moved.

Question 18

___ is a system in which each character transmitted contains ___ additional bit.

Answer 18

__Parity _ is a system in which each character transmitted contains __one_ additional bit.

Question 19

____ addition follows rules similar to decimal addition. When adding with ____ numbers, there are only ____ conditions that can occur.

Answer 19

___Binary_ addition follows rules similar to decimal addition. When adding with __binary__ numbers, there are only ___four_ conditions that can occur.

Question 20

The ___ code is a special type of __ code that does not use ____ weighting. In other words, each position does not have a ____ weight. The ____ code is set up so that as we progress from ___ number to the next, only __ bit changes.

Answer 20

The Gray__ code is a special type of binary__ code that does not use ___position weighting. In other words, each position does not have a __definite__ weight. The ___Gray code is set up so that as we progress from __one_ number to the next, only one bit changes.