Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual do Utilizador descarregar pdf (Página 329)

100

101

Number Systems

Appendix B

B5

Table B.A

BCD

Representation

Place Value

(8) 2

(4) 2

(2) 2

(1)

Decimal Equivalent

The decimal equivalent for a group of 4 binary digits is determined by

multiplying the binary digit by its corresponding place value and adding

these numbers.

Binary coded octal (BCO) uses an arrangement of 8 bits (one byte) to

represent a 3-digit octal number from 000 to 377 (Figure B.5). The 8 bits

are broken down into three groups: 2 bits, 3 bits and 3 bits.

Figure B.5

Binary

Coded Octal

11011111

357

The octal number for each group of bits is determined by multiplying the

binary digit by its corresponding place value and adding these numbers

together (Table B.B).

B.3.2

Binary Coded Octal

1 2 ... 324 325 326 327 328 329 330 331 332 333 334 ... 345 346

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