ABB INNPM22
《厦门莫格电气自动化有限公司》
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主营PLC可编程控制器模块,DCS卡件,ESD系统卡件,振动监测系统卡件,汽轮机控制系统模块,燃气发电机备件等,AB,ABB,GE,本特利,福克斯波罗,霍尼韦尔,西门子,ICS,英维斯,西屋,艾默生,横河,KONRAD
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PPI是点到点的主从协议, PLC的通讯接口缺省情况下工作在PPI从(sl***e)模式,以便接收来自Step7 MicroWin编程软件的数据,Step7 MicroWin自然工作在PPI主(master)模式。E***6802在与PLC相连时,E***6802作为上位机工作在主模式,PLC通讯接口为缺省的从模式。
下面是我们基于PPI协议封装的操作PLC的API函数,详细的函数说明可参考ppi.h头文件。
// 功能描述: 设置相应串口的通讯参数,
HANDLE PPI_OpenPort(LPCTSTR lpPortName);
// 功能描述: 关闭PPI使用的串口设备
BOOL PPI_ClosePort(HANDLE hPort);
// 功能描述: 设置ppi通讯的超时时间,单位为毫秒。默认超时时间为ms
int PPI_SetTimeout(HANDLE hPort, int nMilliseconds);
// 功能描述: 设置两次ppi通讯之间的间隔时间,单位为毫秒。默认时间间隔为ms
int PPI_SetPollDelay(HANDLE hPort, int nMilliseconds);
// 功能描述: 设置设置本机的PPI地址,默认本机地址为x00
BOOL PPI_SetLocalAddress(HANDLE hPort, UINT8 bLocalAddr);
// 功能描述: 与指定的PLC握手
int PPI_FindPLC(HANDLE hPort, UINT8 bSl***eAddr);
// 功能描述: 读取指定PLC的型号和保护等级
int PPI_GetPLCID(HANDLE hPort, UINT8 bSl***eAddr, UINT8 cpuId[], UINT8 *pProtectionLevel);
// 功能描述: 设置PLC工作在RUN模式或STOP模式
int PPI_SetPlcMode(HANDLE hPort, UINT8 bSl***eAddr, int nMode);
// 功能描述: 读PLC指定存储器数据
int PPI_Read(HANDLE hPort, UINT8 bSl***eAddr, LPCSTR lpStorageAddress, UINT8 *pNumofRead, UINT8 readData[]);
// 功能描述: 写PLC指定存储器数据
int PPI_Write(HANDLE hPort, UINT8 bSl***eAddr, LPCSTR lpStorageAddress, UINT8 *pNumofWrite, UINT8 writeData[]);
下图是在WEC7工控主板E***6802上运行的利用PPI API操作PLC的Demo程序,程序实现了搜索PLC、设置PLC工作模式、获取PLC型号信息以及读写PLC存储器等功能。

图2 在WCE上运行的操作PLC的例子程序
E***6802具有相当丰富的通讯接口,与突出控制功能的PLC可以形成良好的功能互补,同时E***6802对大屏显示器的支持也适合用做PLC控制系统的状态监控人机交互终端。
PPI API以lib库的形式提供,可以在英创所有WCE工控主板上运行,图2所示的Demo程序提供源代码参考,感兴趣的用户可与英创联系索要。
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