Siemens SIMATIC S7 - Page 42

SIEMENS AG PRODAVE S7
Toolbox for Data Link PGs/PCs to SIMATIC S7
38
Example:
Input byte 0, output byte 3 and DW 5 from DB 10 are read and the values are
stored in variables e, a and d:
C-Adapter
#include <w95_s7.h>
#pragma pack(1)
typedef struct {
char typ;
char size;
unsigned short dbno;
unsigned short no;
} data_type;
data_type data[10];
#pragma pack()
char buffer[100];
char e,a;
int d;
int error;
:
:
data[0].typ = 'e';
data[0].size= 'b';
data[0].no = 0;
data[1].typ = 'a';
data[1].size= 'b';
data[1].no = 3;
data[2].typ = 'd';
data[2].size= 'w';
data[2].dbno= 10;
data[2].no = 5;
data[3].typ = 0; /* endekennung der liste */
error = mix_read((char*)data,buffer);
e = buffer[0];
a = buffer[1];
d = ((int)buffer[2] << 8) | (int)buffer[3];
:
: