USER MNL. ANALOG INPUT Module Owner manual

Appendix
C
C-1
Data Table Formats
The 4-digit BCD format uses an arrangement of 16 binary digits to
represent a 4-digit decimal number from 0000 to 9999 (Figure C.1). The
BCD format is used when the input values are to be displayed for operator
viewing. Each group of four binary digits is used to represent a number
from 0 to 9. The place values for each group of digits are 2
0
, 2
1
, 2
2
and 2
3
(Table C.A). The decimal equivalent for a group of four binary digits is
determined by multiplying the binary digit by its corresponding place
value and adding these numbers.
Figure C.1
4Digit
Binary Coded Decimal
0 X 2
3
= 0
0 X 2
2
= 0
0 X 2
1
= 0
1 X 2
0
= 1
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
0001001000111001
1
2
3
9
10
1
23
9
12955-I
4Digit Binary Coded
Decimal (BCD)