Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 286)

C-4

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

Table C-3 Integer Range

Format Range

16-bit integer -32,768 to +32,767

1 1 0 0

03748111215Bits

Sign Decimal Values: 32 + 8 + 4 = 44

0 0 1 00 0 0 0

0 0 0 0

Figure C-1 A 16-Bit Integer in Binary Format: +44

An integer is a whole number that has a sign to indicate whether it is positive

or negative. In memory, a 32-bit integer (double integer) takes up two words

of space. Table C-4 shows the range of a double integer. Figure C-2 shows

the integer - 500,000 in binary format. In binary format, the negative form of

an integer is represented as the twos complement of the positive form of that

integer. You obtain the twos complement of an integer by inverting the signal

states of all bits and then adding + 1 to the result.

Table C-4 Double Integer Range

Format Range

32-bit integer -2,147,483,648 to +2,147,483,647

0 0 0 0

037481112

Bits

Sign

151619202324272831

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

Figure C-2 A 32-Bit Integer in Binary Format: -500,000

A real number (also called floating-point number) is a positive or negative

number that includes a decimal value, for example, 0.339 or - 11.1. You can

also include an exponent with a real number to indicate the integer power of

10 by which the real number is multiplied to obtain the value you want to

represent. For example, you can represent 1,234,000 as 1.234E6 or 1.234e6

(that is, 1.234  10

). Table C-5 shows the range of a real number.

In memory, a real number takes up two words of space (32 bits, see

Figure C-3). The most significant bit indicates the sign of the number (bit 31,

where 0 indicates plus, 1 indicates minus). The other bits represent the

exponent and the mantissa.

Double Integers:

32 Bits

Real Numbers

Number Notation

1 2 ... 281 282 283 284 285 286 287 288 289 290 291 ... 317 318

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