Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 287)

C-5

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

C79000-G7076-C504-02

Table C-5 Real Number Ranges

Format Range

Real numbers

-3.402823E+38 to -1.175495E-38

and " 0 and

+1.175495E-38 to +3.402823E+38

If the result of a floating-point operation falls into the ranges of -1.175495E-38 to

-1.401298E-45 or +1.401298E-45 to +1.175495E-38, then an underflow is

generated (see Table 12-6). This is the range of denormalized numbers.

Real numbers (also called floating-point numbers) in ladder logic conform to

the basic format, single width, described in ANSI/IEEE Std 754-1985, IEEE

Standard for Binary Floating-Point Arithmetic. In this format, you can

represent only those values that are specified by the following three integer

parameters:

S p = the number of significant bits (precision)

S E

max

= the maximum exponent

S E

min

= the minimum exponent

Table C-6 shows the format parameters.

Table C-6 Format Parameters for Real Numbers

Parameter Name Parameter Value

p 24

Emax +127

Emin -126

Exponent bias +127

Exponent width in bits 8

Format width in bits 32

The format includes the following entities:

S Numbers of the form (-1)

. b

...b

p-1

), where

– s = 0 or 1

– E = any integer between E

min

and E

max

, inclusive

–b

= 0 or 1

S Two infinities, +R and -R

S At least one signaling NaN (NaN means “not a floating-point number”)

S At least one quiet NaN (NaN means “not a floating-point number”)

Format for Real

Numbers

Number Notation

1 2 ... 282 283 284 285 286 287 288 289 290 291 292 ... 317 318

Kommentare zu diesen Handbüchern

Keine Kommentare

Siemens NAN 67 Series Wartungshandbuch Seite 287

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Kochfelder Siemens NAN 67 Series