Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 163)

12-7

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

C79000-G7076-C504-02

12.6 Evaluating the Bits of the Status Word After Floating-Point

Instructions

The math instructions affect the following bits in the status word:

S CC 1 and CC 0

S OV

S OS

A hyphen (–) entered in a bit column of the table means that the bit in

question is not affected by the result of the integer math instruction.

Table 12-5 Signal State of Status Word Bits for Floating-Point Math Result

that is in Valid Range

Valid Range for a Floating-Point Result (32 Bits)

Bits of Status Word

lid

ange

or a

ng-

esu

(32

Bit

)

CC 1 CC 0 OV OS

+0, -0 (zero) 0 0 0 –

-3.402823E+38 t Result t -1.175494E-38

(negative number)

0 1 0 –

+1.175494E–38 t Result t 3.402823E+38

(positive number)

1 0 0 –

Table 12-6 Signal State of Status Word Bits for Floating-Point Math Result

that is not in Valid Range

Range Not Valid for a Floating-Point Result

Bits of Status Word

(32 Bits)

CC 1 CC 0 OV OS

-1.175494E-38 t Result t -1.401298E-45

(negative number) Underflow

0 0 1 1

+1.401298E-45 t Result t +1.175494E-38

(positive number) Underflow

0 0 1 1

Result t -3.402823E+38

(negative number) Overflow

0 1 1 1

Result u -3.402823E+38

(positive number) Overflow

1 0 1 1

Result < -3.402823E+38

or Result > +3.402823E+38

no floating-point number

1 1 1 1

Description

Floating-Point Math Instructions

1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 317 318

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