Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Uživatelský manuál stáhnout pdf (Strana 139)

Data Encoding and Addressing

Chapter 6

6-2

Binary

The binary number system is probably the simplest to use for computer

and PC applications because it is the most natural way to represent data

bits. However, since the binary system uses only the digits 0 and 1, it is

cumbersome to show values in binary format.

Each digit in a binary number has a certain place value expressed as a

power of 2. You can calculate the decimal equivalent of a binary number

by multiplying each binary digit by its corresponding place value and then

adding the results of the multiplications. Figure 6.1 shows the binary

representation of the decimal number 239.

Figure 6.1

Binary

Numbers

11101111

10240

128

1 x 2

= 128

1 x 2

= 64

1 x 2

= 32

0 x 2

= 0

1 x 2

= 8

1 x 2

= 4

1 x 2

= 2

1 x 2

= 1

239

11101111

= 239

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 234 235

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Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Uživatelský manuál Strana 139