turck 100000897, Инструкция по эксплуатации

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Commissioning
Programming digital channels (DXP)
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7.6.5 Programming DXP channels with C or C++
The following example shows the programming of the digital I/O channels with Ansi C/C++.
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
// initialize function (use extern for C++)
int access(const char *pfad, int modus);
int main(void) {
//choose DXP / GPIO for connection
char input[2];
/*
==============================================================
==============
READ:
==================================================================
==========*/
{
// file doesn't exist!
// export gpio...
if((fh = fopen("/sys/class/gpio/export", "w")) !=
{
fputs("59",fh);
fclose(fh);
}
else
{
printf("failed on export to read...\n");
printf("result: %i \n", (int)fh);
return -1;
}