Allen-Bradley PLC-2/30 - Binary Coded Decimal

Number Systems
Appendix B
B4
Binary coded decimal (BCD) uses an arrangement of 12 binary digits to
represent a 3-digit decimal number from 000 to 999 (Figure B.4). Each
group of 4 binary digits is used to represent a decimal number from 0 to 9.
The place values for each group of 4 digits are 20, 21, 22 and 23
(Table B.A).
Figure B.4
Binary
Coded Decimal
001000111001
10
0 x 2
3
= 0
0 x 2
2
= 0
1 x 2
1
= 2
0 x 2
0
= 0
0 x 2
3
= 0
0 x 2
2
= 0
1 x 2
1
= 2
1 x 2
0
= 1
1 x 2
3
= 8
0 x 2
2
= 0
0 x 2
1
= 0
1 x 2
0
= 1
B.3.1
Binary Coded Decimal
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