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12-6

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

C79000-G7076-C504-02

12.5 Divide Floating-Point Numbers

A signal state of 1 at the Enable (EN) input activates the Divide

Floating-Point Numbers instruction. This instruction divides input IN1 by

IN2. The result can be scanned at O. If the result is outside the permissible

range for a floating-point number (overflow or underflow), the OV and the

OS bit of the status word are 1 and ENO is 0. You will find information on

evaluating the displays in the status word in Section 12.6.

Certain restrictions apply to the placement of floating-point math boxes (see

Section 6.1).

Table 12-4 Divide Real Box and Parameters

LAD Box Parameter Data Type Memory Area Description

DIV R

EN BOOL I, Q, M, D, L Enable input

DIV

EN ENO

ENO BOOL I, Q, M, D, L Enable output

IN1

IN1 REAL I, Q, M, D, L Dividend

IN1

IN2 O

IN2 REAL I, Q, M, D, L Divisor

O REAL I, Q, M, D, L Result of division

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x x x x x x 1 x x

I 0.0

A signal state of 1 at input I 0.0 activates the

DIV_R box. The result of dividing MD0 by

MD4 is put into memory double word MD10.

If the result is outside the permissible range

for a real number or the signal state of input

I 0.0 is 0, output Q 4.0 is set.

Q 4.0

DIV_R

IN2

EN ENO

MD4 MD10

IN1MD0

Function is executed (EN = 1):

NOT

Figure 12-4 Divide Real

Description

Floating-Point Math Instructions

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 317 318

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