Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 193)

14-15

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

C79000-G7076-C504-02

14.13 Round to Double Integer

The Round to Double Integer conversion instruction reads the contents

specified in the input parameter IN as a real number and converts this

number to a double integer, by rounding it to the nearest whole number. The

result is the nearest integer component (that is, the nearest whole number).

The output parameter OUT provides the result. If an overflow occurs, ENO

is 0.

Certain restrictions apply to the placement of the Round to Double Integer

conversion box (see Section 6.1).

Table 14-13 Round to Double Integer Box and Parameters

LAD Box Parameter Data Type Memory Area Description

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

ROUND

EN ENO

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

IN OUT

IN REAL I, Q, M, D, L Value to round

OUT DINT I, Q, M, D, L IN rounded to nearest whole number

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x – – x x x 1 x x

I 0.0

If the signal state of input I 0.0 is 1, the

conversion is executed. The contents of

memory double word MD8 is read as a real

number and converted to a double integer.

The result of this round-to-nearest function is

stored in memory double word MD12. If an

overflow occurred, the signal state of output

Q 4.0 is 1. If the signal state at input EN is 0

(that is, if the conversion is not executed), the

signal state of output Q 4.0 is also 1.

Q 4.0

ROUND

EN ENO

MD8 MD12

Function is executed (EN = 1):

NOT

OUT

Figure 14-13 Round to Double Integer

Description

Move and Conversion Instructions

1 2 ... 188 189 190 191 192 193 194 195 196 197 198 ... 317 318

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