Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules Manual de usuario descargar pdf (Pagina 118)

Publication 1769-UM014B-EN-P - May 2010

E-2 Two’s Complement Binary Numbers

Negative Decimal Values

In two’s complement notation, the far left position is always 1 for negative

values. The equivalent decimal value of the binary number is obtained by

subtracting the value of the far left position, 32768, from the sum of the values

of the other positions. In Figure E.2 all positions are 1 and the value is 32767 -

32768 = -1.

Figure E.2 Negative Decimal Values

EXAMPLE

1111 1000 0010 0011 = (2

14+

13+

12+

11+

) - 2

(16384+8192+4096+2048+32+2+1) - 32768 =

30755 - 32768 = -2013

1 x 2 = 2

1 x 2 = 1

1 x 2 = 16384

1 x 2 = 8192

1 x 2 = 4096

1 x 2 = 2048

1 x 2 = 1024

1 x 2 = 128

1 x 2 = 512

1 x 2 = 256

1 x 2 = 64

1 x 2 = 32

1 x 2 = 16

1 x 2 = 8

1 x 2 = 4

1 x 2 = 32768

1111111111111111

16384

8192

4096

2048

1024

512

256

128

32767

This position is always 1 for negative numbers.

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 127 128

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules Manual de usuario Pagina 118

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