Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE - Manual (Page 53)

Data Formats
Appendix C
CĆ2
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
Signed-magnitude Binary