Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Pobierz pdf (Strona 142)

Data Encoding and Addressing

Chapter 6

6-5

Figure 6.4

Hexadecimal

Numbers

00 0000 0110100111

11335

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

1 x 2

= 1

1 x 2

= 8

0 x 2

= 0

1 x 2

= 2

0 x 2

= 0

0 x 2

= 0

1 x 2

= 4

1 x 2

= 2

1 x 2

= 1

0 x 16

= 0

1 x 16

= 256

10 x 16

= 160

7 x 16

= 7

01A7

= 423

Octal

The octal number system is also a relatively easy way to represent binary

data. This system uses the eight digits 0 through 7.

Each group of three data bits represents one octal digit between 0 and 7.

This factor presents a slight conversion problem because bytes and words

usually contain an even number of bits. Thus, an 8-bit byte can have an

octal value between 0 and 377, while a 16-bit word can have an octal

value between 0 and 177,777.

Each digit of an octal number has a place value that is a multiple of 8. To

convert from octal to decimal, multiply each octal digit by its

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 234 235

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