The Program Design Of OPC Server Based On Can Field Bus

OPC (OLE for Process Control), object linking and embedded technology ,has been widely applied in the field of industrial process control. OPC supplies manufacturers with a public interface for different hardware devices, software and system. In that case, equipments and software can connect, communicate, operate with each other, thus enhance the system expansive property. Since OPC can greatly save repeated design time during the system integration process and significantly cut down the costs for hardware and software maintenance, it has comprehensive developed prospect.In this paper, the producing, characters, application and prospect of OPC technology are intrduced first. OPC server based on CAN bus is designed which complies with the OPC specification. The functions, OPC server can access and store the real-time data, are realized on iCAN experiment development platform. This paper has several aspects as follows:First, by using OPC rapid development tool we do researches on OPC data access method , OPC standard interface functions are realized, and the OPC Data Access Server in line with the OPC standard is developed,。In our design the seamless connectivity with the third-party client software is realized, including the OPC server and OPC client communication mechanism and OPC server's registration.Second, the functions and the data conversion format of CANET-E network adapter is introduced. We realized the information accessing function between the OPC server with the scene communication network comprising CANET-E and iCAN function modules.Third, SQL Server database based on ADO technology is designed which used for real-time data storage and query.Fourth, OPC server is tested using OPC client software.The OPC Server is a good monitor to the actual communication situation of CAN network. The design is feasible.