Rockwell-automation 1771-IFE ANALOG INPUT MODULE Uživatelský manuál stáhnout pdf (Strana 69)

D–2 Data Table Formats

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

Table D.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 ... 64 65 66 67 68 69 70 71 72 73 74 ... 81 82

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Rockwell-automation 1771-IFE ANALOG INPUT MODULE Uživatelský manuál Strana 69