Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 191)

14-13

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

C79000-G7076-C504-02

14.11 Twos Complement Double Integer

The Twos Complement Double Integer instruction reads the contents

specified in the input parameter IN and changes the sign (for example, from a

positive value to a negative value). The output parameter OUT provides the

result. If the signal state of EN is 0, then the signal state of ENO is 0. If the

signal state of EN is 1 and an overflow occurs, the signal state of ENO is 0.

Certain restrictions apply to the placement of the Twos Complement Double

Integer

conversion box (see Section 6.1).

Table 14-11 Twos Complement Double Integer Box and Parameters

LAD Box Parameter Data Type Memory Area Description

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

NEG

EN ENO

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

IN OUT

IN DINT I, Q, M, D, L Input value

OUT DINT I, Q, M, D, L Twos complement double integer

Status Word Bits

I 0.0

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

is executed. The value of memory double word

MD8 is provided at OUT in memory double word

MD10 with the opposite sign, as shown in the

following example:

MD8 = +60.000 → MD10 = – 60.000.

If the signal state of EN is 1 and an overflow

occurs, the signal state of ENO is 0 and the signal

state of output Q 4.0 is 1. If the conversion is not

executed, the signal state of output Q 4.0 is 1

(ENO = EN).

Q 4.0

NEG_DI

EN ENO

MD12INMD8

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x x x x x x 1 x x

Function is executed (EN = 1):

NOT

OUT

Figure 14-11 Twos Complement Double Integer

Description

Move and Conversion Instructions

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 317 318

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