siemens_mpi.h

本源代码演示了通过串口利用MPI协议与西门子PLC S7-300系统通讯的实现方式。

//
//SIEMENS_MPI.H
//

#ifndef _FILE_SIEMENS_MPI_H_FILE
#define _FILE_SIEMENS_MPI_H_FILE
#ifdef __cplusplus
extern "C" {
#endif
/***************************************************************************/
/* typedef for addess table    max 16 connections                          */
/***************************************************************************/
#pragma pack(1)
typedef struct 
	{
	unsigned char  adr;          /* stationsadresse     default 2          */
	unsigned char  segmentid;    /* segment id          default 0          */
	unsigned char  slotno;       /* slot no             default 2          */
	unsigned char  rackno;       /* rack no             default 0          */
	} adr_table_type;
#pragma pack()
/***************************************************************************/

//Show error message
void WINAPI ErrorMessage(int errorNo,char* buffer);

//Open the comm with specific parameters
BOOL WINAPI ComOpen( LPVOID pData );			


//close the comm port
void WINAPI ComClose();


//bit read and write
//deviceNo: the device number, I3.1,deviceNo is 3
//bitNo: offset of bit,I3.1,bitNo is 1
//value: store the result of I3.1,0 or  1
//return value: the error code
//对Discrete Inputs读取Data (bit)
int WINAPI PLC_R_I(int deviceNo,int bitNo,int* value); 

// int PLC_W_I(int deviceNo,int bitNo,bool bValue)
// {
// 	int iValue;
// 	int error;
// 	error = e_field_read(deviceNo,1,&iValue);
// 	iValue = BitSet(iValue,bitNo,bValue);
// 
// }
int WINAPI PLC_R_Q(int deviceNo,int bitNo,int* value);

int WINAPI PLC_W_Q(int deviceNo,int bitNo,bool bValue);

int WINAPI PLC_R_M(int deviceNo,int bitNo,int* value);

int WINAPI PLC_W_M(int deviceNo,int bitNo,bool bValue);

int WINAPI PLC_R_DB(int blockNo,int deviceNo,int bitNo,int* value);

int WINAPI PLC_W_DB(int blockNo,int deviceNo,int bitNo,bool bValue);

//WORD and DWORD read and write
int WINAPI PLC_R_IW(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_ID(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_QW(int deviceNo,int amount,void* buffer);

int WINAPI PLC_W_QW(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_QD(int deviceNo,int amount,void* buffer);

int WINAPI PLC_W_QD(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_MW(int deviceNo,int amount,void* buffer);

int WINAPI PLC_W_MW(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_MD(int deviceNo,int amount,void* buffer);

int WINAPI PLC_W_MD(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_DBW(int blockNo,int deviceNo,int amount,void* buffer);

int WINAPI PLC_W_DBW(int blockNo,int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_DBD(int blockNo,int deviceNo,int amount,void* buffer);

int WINAPI PLC_W_DBD(int blockNo,int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_T(int deviceNo,int amount,void* buffer);

int WINAPI PLC_R_C(int deviceNo,int amount,void* buffer);

void WINAPI Gp_to_Float(void* gpValue,void*flValue);

void WINAPI Float_to_Gp(void* flValue,void* gpValue);

int WINAPI OpenPLC(int nr,char* device,adr_table_type* adr_table);

int WINAPI ClosePLC();

void WINAPI SwapShort(short& data);

void WINAPI SwapLong(long& data);

#ifdef __cplusplus
} /* extern "C" */
#endif
#endif	//_FILE_SIEMENS_MPI_H_FILE