Rockwell Automation 1771-OFE/B Analog Output Module User Manual - Manual (Page 76)

C-2
Publication 1771Ć6.5.30 - November 1998
Table C.A
BCD Representation
Place Value
2 3 (8) 2 2 (4) 2 1 (2) 2 0 (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
2
= 22
10
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
SignedĆmagnitude Binary