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12-12

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

C79000-G7076-C504-02

12.10 Establishing the Exponential Value of a Floating-Point Number

With the Establishing the Exponential Value of a Floating-Point Number

instruction you can establish the exponential value of a floating-point number

to base e (= 2.71828...).

You can find information on the effects that the instruction EXP has on the

status bits CC 1, CC 0, OV and OS in Section 12.6.

Table 12-11 Box EXP and Parameters

LAD Box Parameter Data

Type

Memory

Area

Description

EXP

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

EXP

EN ENO

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

IN OUT

ENO

IN REAL I, Q, M, D, L Number

OUT REAL I, Q, M, D, L Exponent of the

number

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x x x x x 0 x x 1

Function is executed (EN = 1):

I 0.0

Q 4.0

EXP

OUT

EN ENO

MD10

INMD0

NOT

The box EXP is activated when I 0.0 = 1. The

result of EXP (MD0) is stored in the memory

double word MD10. If MD0 < 0 or if the result

is outside of the permissible area for

floating-point numbers or if the signal state of

I 0.0 = 0, output Q 4.0 is set.

Figure 12-8 Establishing the Exponential Value of a Floating-Point Number

Description

Floating-Point Math Instructions

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 317 318

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