Design of Distributed Monitoring and Control System Based on OPC XML-DA
Sun Ru-peng, Zhiping Jia, WU Shunpeng · Jisuanji gongcheng · 2006
After analyzing the architecture of distributed monitoring and control system,the design of distributed monitoring and control system based on the OPC XML-DA standard is presented in this paper.According to the practice sea environment monitoring system,the framework of server side program is given and the series service of“subscribe”is described in detail.According to the real time requirement of sea environment data,standard“Read”service based on the persistent connection mechanism of HTTP 1.1 protocol is extended.