WAGO 750 Series User Manual

Application Examples • 185
Example of Reading and Writing from the NVRAM
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
Example Program
#include <fcntl.h>
#include <stdio.h>
int main()
{
int i;
int file;
ssize_t sstmp;
char buf[2048];
/*Open Device*/
if((file = open(“/dev/nvram“)) < 0)
{
printf(“ERROR: Can’t open device
(\”/dev/nvram\”)\n”);
close(file);
exit(1);
}
/*Read Device*/
sstmp = read(file, buf, 8);
printf(“read %d bytes\n”, sstmp);
if(sstmp != 8)
{
printf(“ERROR: Reading NVRAM failed\n”);
}
else
{
printf(“read(%x %x %x %x %x %x %x %x)\n”, buf[0] ,
buf[1] , buf[2] , buf[3] , buf[4] , buf[5] , buf[6]
, buf[7]);
}
/*Trivial change of values*/
for(i=0;i<8;i++)
buf[i] += 1;
/*Write into Device*/
if(-1 == lseek(file, 0, SEEK_SET))
printf(“ERROR: lseek failed\n”);
sstmp = write(file, buf, 8);
printf(“Write (%d) bytes\n”, sstmp);
if(sstmp != 8)
printf(“ERROR: Writing into Device failed\n”);
/*close device*/
close(file);
}

WAGO 750 Series Specifications

General

Protection Class	IP20
Bus Couplers	PROFIBUS, CANopen, Ethernet
Modules	Digital Input, Digital Output, Analog Input, Analog Output
Mounting	DIN rail mounting
Voltage Supply	24 V DC (typical)
Communication Protocol	Depends on the bus coupler (e.g., PROFIBUS, CANopen, DeviceNet, Ethernet)
Digital Input Channels	Varies by module (e.g., 8, 16 channels)
Digital Output Channels	Varies by module (e.g., 8, 16 channels)
Analog Input Channels	Varies by module (e.g., 2, 4, 8 channels)
Analog Output Channels	1, 2, 4 channels (depending on module)
Width	12 mm, 24 mm (typical module widths)
Number of Channels	Varies by module type
Current Consumption per Channel	Varies by module type