Siemens S7-200

[Clive]

Hi

I am new to libnodave library and siemens PLC. I have installed the library on a CentOS.

To familiarize with this library I have tried the sample code provided testPPI.c on Netbeans IDE.It compiled without errors. I am using Siemens USB/PPI Multi-Master cable 6ES7 901-3DB30-0XA0 which when connect to USB port on my PC the LEDs blink momentarily twice and turn off.Then I use linux lsusb command to check if the cable has been detected and shows on terminal Siemens AG.

When I debug the code the serial port is found but the function daveConnectPLC returns a value of (-1025) and then a timeout error is displayed. It seems that there is driver issue with the cable but not sure.

Has someone encountered such problem ? How can I solve it ? Thanks. I tried alot without success.

Following is the code I a trying.

define LINUX

include <stdlib.h></stdlib.h>

include <stdio.h></stdio.h>

include "nodave.h"

include "nodave.c"

include "setport.h"

include "setport.c"

int main(int argc, char **argv) {
int a,b,c,
res;
float d;
daveInterface * di;
daveConnection * dc;
_daveOSserialType fds;

//if (-3<2) {

// printf("Usage: testPPI serial port.\n");
// exit(-1);
//}

fds.rfd=setPort("/dev/ttyS0","9600",'E');
fds.wfd=fds.rfd;
if (fds.rfd>0) { 
di =daveNewInterface(fds, "IF1", 0, daveProtoPPI, daveSpeed9k);
dc =daveNewConnection(di, 2, 0, 0);  
daveConnectPLC(dc);
printf("Trying to read 16 bytes from FW0.\n");
res=daveReadBytes(dc,daveFlags,0,0,16,NULL);
if (res==0) {
        a=daveGetU32(dc);
        b=daveGetU32(dc);
    c=daveGetU32(dc);
        d=daveGetFloat(dc);
    printf("FD0: %d\n",a);
    printf("FD4: %d\n",b);
    printf("FD8: %d\n",c);
    printf("FD12: %f\n",d);
}

return 0;
} else {
printf("Couldn't open serial port %s\n","testPPI"); 
return -1;
}

}

[Anonymous]

[Anonymous]