Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Manuel d'utilisateur télécharger pdf (Page 91)

1 Publication 1769-UM008A-EN-P - November 2001

Appendix

Two’s Complement Binary Numbers

The processor memory stores 16-bit binary numbers. Two’s

complement binary is used when performing mathematical

calculations internal to the processor. Analog input values from the

analog modules are returned to the processor in 16-bit two’s

complement binary format. For positive numbers, the binary notation

and two’s complement binary notation are identical.

As indicated in the figure on the next page, each position in the

number has a decimal value, beginning at the right with 2

and ending

at the left with 2

. Each position can be 0 or 1 in the processor

memory. A 0 indicates a value of 0; a 1 indicates the decimal value of

the position. The equivalent decimal value of the binary number is the

sum of the position values.

Positive Decimal Values

The far left position is always 0 for positive values. As indicated in the

figure below, this limits the maximum positive decimal value to 32640

(all positions are 1 except the far left position).

0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0

0 x 2

= 0 This position is always 0 for positive numbers.

1 x 2

= 16384

1 x 2

= 8192

1 x 2

= 4096

1 x 2

= 2048

1 x 2

= 1024

1 x 2

= 512

1 x 2

= 256

1 x 2

= 128

0 x 2

= 64

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

0 x 2

= 0

16384

8192

4096

2048

1024

512

256

128

________

32640

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 103 104

Commentaires sur ces manuels

Pas de commentaire

Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Manuel d'utilisateur Page 91

Commentaires sur ces manuels

Produits connexes et manuels pour Équipement Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I