Rockwell-automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Modu Manuel d'utilisateur télécharger pdf (Page 52)

Appendix

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

, 2

and 2

(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

= 0

0 X 2

= 0

0 X 2

= 0

1 X 2

= 1

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

0001001000111001

12955-I

4Digit Binary Coded

Decimal (BCD)

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 62 63

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