Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Uživatelský manuál stáhnout pdf (Strana 140)

100

101

Data Encoding and Addressing

Chapter 6

6-3

Binary Coded Decimal

PC data is often represented in binary coded decimal (BCD) form. In this

system, each group of four bits in a PC word represents one decimal

number between 0 and 9. In this way, each 16-bit word can represent a

BCD value between 0 and 9,999. Figure 6.2 shows the BCD

representation of the decimal number 239.

Figure 6.2

BCD

Representation of Decimal 239

001000111001

239

10241

0 x 2

= 0

0 x 2

= 0

1 x 2

= 2

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

1 x 2

= 2

1 x 2

= 1

1 x 2

= 8

0 x 2

= 0

0 x 2

= 0

1 x 2

= 1

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 234 235

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