Db_Buch - Siemens SIMATIC S7 Operating Instructions Manual

Prodave s7 v5.5 toolbox for windows 95/98/nt/me/2000 applications for a data link of pgs/pcs to simatic s7 via mpi interface and pc/mpi cable

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SIEMENS AG

db_buch

The function db_buch checks which DBs exist in the PLC.

For this purpose a buffer of 512 words must be made available (see example).

If the value in buffer [123] is = 0 this means that block DB 123 does not exist in

the PLC.

If there were no errors, the function supplies 0 as the return value otherwise an

error message which can be evaluated in accordance with the error table (see

error_message).

C-Adapter

int

db_buch (void * buffer);

Example:

The program checks if DB 123 exists in the PLC.

C-Adapter

#include <w95_s7.h>

unsigned short buffer[512];

int

error;

error = db_buch(buffer);

if (buffer[123] != 0)

{

/* DB 123 ist im AG vorhanden */

}

error = unload_tool();

Toolbox for Data Link PGs/PCs to SIMATIC S7

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