Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 141)

Data Encoding and Addressing

Chapter 6

6-4

Decimal

The decimal number system is probably the easiest for us to use because it

is the most familiar to us. It uses the common digits 0 through 9, and each

digit has a place value that is a power of 10 (Figure 6.3). However,

despite the convenience of decimal numbers, it is often easier to convert

binary data to a number system other than decimal.

Figure 6.3

Decimal

Representation, Number 239

239

10238

200

2 x 10

= 200

3 x 10

= 30

9 x 10

= 9

10 239

Hexadecimal

The hexadecimal number system is the most compact way to represent

binary data, and it allows for the easiest conversion to and from binary.

This system uses a number set of 16 digits: the numbers 0 through 9 and

the letters A through F (where the letters A through F are equivalent to the

decimal numbers 10 through 15, respectively).

Each group of four data bits represents one hexadecimal digit between 0

and F. In this way, each 16-bit data word can have a hexadecimal value

between 0 and FFFF.

Each digit of a hexadecimal number has a place value that is a multiple of

16. To convert a hexadecimal number to its decimal equivalent, multiply

each hexadecimal digit by its corresponding place value and add the

results of the multiplications. Figure 6.4 shows the hexadecimal

representation of the decimal number 423.

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 234 235

Sin comentarios

Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario Pagina 141