Rockwell-automation 1771-OFE/B Analog Output Module User Manual Manual de usuario descargar pdf (Pagina 76)

C-2

    

Table C.A

BCD Representation

Place Value

(8) 2

(4) 2

(2) 2

(1)

Decimal

Equivalent

    

    

    

    

    

    

    

    

    

    

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

SignedĆmagnitude Binary

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 82 83 84

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Rockwell-automation 1771-OFE/B Analog Output Module User Manual Manual de usuario Pagina 76