Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 142)

Data Encoding and Addressing
Chapter 6
6-5
Figure 6.4
Hexadecimal Numbers
0 0 0 0 0 0 0 1 1 0 1 0 0 1 1 1
11335
0 x 2 3 = 0
0 x 2 2 = 0
0 x 2 1 = 0
0 x 2 0 = 0
0 x 2 3 = 0
0 x 2 2 = 0
0 x 2 1 = 0
1 x 2 0 = 1
1 x 2 3 = 8
0 x 2 2 = 0
1 x 2 1 = 2
0 x 2 0 = 0
0 x 2 3 = 0
1 x 2 2 = 4
1 x 2 1 = 2
1 x 2 0 = 1
0
16
1
16
A
16
7
16
0 x 16 3 = 0
1 x 16 2 = 256
10 x 16 1 = 160
7 x 16 0 = 7
01A7
16
= 423
10
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