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14-16

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

C79000-G7076-C504-02

14.14 Truncate Double Integer Part

The Truncate Double Integer Part 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 lower or equal

whole number. The result is the integer component of the specified real

number (that is, the whole number part of the real number). The output

parameter OUT provides the result. If an overflow occurs, ENO is 0.

Certain restrictions apply to the placement of the Truncate Double Integer

Part conversion box (see Section 6.1).

Table 14-14 Truncate Double Integer Part Box and Parameters

LAD Box Parameter Data Type Memory Area Description

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

TRUNC

EN ENO

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

IN OUT

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

IN OUT

OUT DINT I, Q, M, D, L Whole number part of IN value

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 integer component is the result and 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

TRUNC

EN ENO

MD8 MD12

Function is executed (EN = 1):

NOT

OUT

Figure 14-14 Truncate Double Integer Part

Description

Move and Conversion Instructions

1 2 ... 189 190 191 192 193 194 195 196 197 198 199 ... 317 318

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