基于OPC技术的Web工控系统的研究与实现

Research and Implementation of Web Industrial Control System Based on OPC Technology

通过对传统工业控制系统的分析和改进,研究了基于Java Web实现实时工业控制系统。系统使用DCOM技术远程访问OPC Server获取PLC数据,把PLC采集的实时数据保存到Redis中。采用基于消息的订阅/发布模式实时控制PLC设备,构建了读、写分离的双线程数据同步模式,有效解决了远程控制中的实时数据存储和指令并发控制的问题。在某市水利监控项目中成功应用该技术,通过OPC Server与Web平台的相互协作,实现了水泵、闸门的远程启动和停止。

A Java Web based real-time industrial control system is developed through analysis and improvement of traditional industrial control system.It utilized DCOM technology to obtain PLC data by remote access to OPC Server and then utilizes Redis to save the collected data. It adopted subscribe/publish mode based on message to control PLC all the time and constructed a double thread data synchronization mode where reading and writing are separate. By this way, it solved the problem of real-time data storage and instruction concurrency control in remote control system effectively. This technology was successfully applied in water conservancy supervision. Through the cooperation of OPC Server and Web,remote on and off of water pump and gate was realized.