Rockwell Automation 1747-PCINT API Software for 1746 I/O - Manual (Page 32)

3–6 Developing Applications
Publication 1747-6.5.3 June 1998
Programming
Example for DOS The following DOS example ( sample.c on your API disk) shows how to program
the above steps. Callouts on the right margin identify the code for each step.
/************************************************************************
*
*
FILE:sample.c
*
*
PURPOSE:Sample application code for 1746 I/O PCI Interface API
*
*
SUMMARY:This program,
* - Resets and initializes the scanner.
* - Displays the scanner firmware and hardware versions.
* - Autconfigures the I/O in chassis.
* - Reads the front panel switch position and lights LED 1.
* - Reads first discrete input module data word.
* - Writes incremental data to first output module data word.
* - Closes connection to scanner and exits.
*
*
ENVIRONMENT:1747-PCIS 1746 I/O PCI Interface
* MS-DOS
* Borland/Microsoft C/C++ Compiler (16-bit)
*
************************************************************************/
/*=======================================================================
= INCLUDE FILES =
=========================================================================*/
#include ”ocapi.h”
#include
#include
#include
#include
#include
/*=======================================================================
= MODULE WIDE GLOBAL VARIABLES =
=========================================================================*/
HANDLE Handle; /* Software ID to scanner device */
OCIOCFG OCcfg; /* Chassis I/O config. data structure */
/*=======================================================================
= FUNCTION PROTOTYPES =
=========================================================================*/
void Ioexit( int );
/*=======================================================================
= MAIN PROGRAM =
=========================================================================*/
void main()
{
int retcode; /* Return code from API calls */
int i;
int slots;
int input_slot, input_found = 0;
int output_slot, output_found = 0;
OCINIT ocpart;
BYTE status;
OCVERSIONINFO verinfo;
BYTE swpos;
WORD wData;