Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 158)

12-2

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

C79000-G7076-C504-02

12.1 Overview

You can use the floating-point math instructions to perform the following

math instructions using two 32-bit IEEE floating-point numbers:

S Add

S Subtract

S Multiply

S Divide

The IEEE 32-bit floating-point numbers belong to the data type called

REAL. For information on the format of floating-point (real) numbers, see

Appendix C.

Using floating-point math, you can carry out the following operations with

one 32-bit IEEE floating-point number:

S Establish the square (SQR) and the square root (SQRT) of a floating-point

number

S Establish the natural logarithm (LN) of a floating-point number

S Establish the exponential value (EXP) of a floating-point number to base

e (= 2.71828...)

S Establish the following trigonometrical functions of an angle represented

as a 32-bit IEEE floating-point number:

– Establish the sine of a floating-point number (SIN) and establish the

arc sine of a floating-point number (ASIN)

– Establish the cosine of a floating-point number (COS) and establish

the arc cosine of a floating-point number (ACOS)

– Establish the tangent of a floating-point number (TAN) and establish

the arc tangent of a floating-point number (ATAN)

Floating-Point Math Instructions

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