SIEMENS AG PRODAVE S7
Toolbox for Data Link PGs/PCs to SIMATIC S7
29
db_write
The function db_write writes an amount of data words from a variable field of
the PG/PC into the PLC.
If the data block does not exist this is indicated by a return value = error
number.
If the data which is being written, exceeds the amount available in the data
block, the " amount” is corrected and error message 303 hex is returned.
Important!
The data words must be stored in "buffer" in accordance with STEP5-Notation
(high byte - low byte).
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).
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See also db_read
C-Adapter (mini)
int db_write
(int dbno,int dwno, int* amount, void* buffer);
Example:
DB10 consisting of 20 data words (DW 0 - DW 19) exists in the PLC.
Value 2468 hex is assigned to DW 1 and DW 2.
C-Adapter
#include <w95_s7.h>
int buffer[100];
int error,dbno,dwno,amount;
:
dbno = 10;
dwno = 1;
amount = 2;
buffer[0] = 0x6824;
buffer[1] = 0x6824;
error = db_write(dbno,dwno,&amount,buffer);
:
error = unload_tool();
:
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