Rockwell-automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Modu Manuel d'utilisateur télécharger pdf (Page 53)

Data Formats

Appendix C

C-2

Table C.A

BCD

Representation

Place V

alue

(8) 2

(4) 2

(2)

(1)

Decimal

Equivalent

0 0 0 0 0

0 0 0 1 1

0 0 1 0 2

0 0 1 1 3

0 1 0 0 4

0 1 0 1 5

0 1 1 0 6

0 1 1 1 7

1 0 0 0 8

1 0 0 1 9

Signed–magnitude binary is a means of communicating numbers to your

processsor. It should be used with the PLC-2 family when performing

computations in the processor. It cannot be used to manipulate binary

12-bit values or negative values.

Example: The following binary number is equal to decimal 22.

10110

= 22

The signed–magnitude method places an extra bit (sign bit) in the

left–most position and lets this bit determine whether the number is

positive or negative. The number is positive if the sign bit is 0 and negative

if the sign bit is 1. Using the signed magnitude method:

0 10110 = +22

1 10110 = –22

Signedmagnitude Binary

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 62 63

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