Application And Research Of ControlNet And OPC Technology In Sewage Treatment Control System

With the improvement of people’s living standard, the development of urbanization and the needs of national sustainable development strategy, the problem of urban sewage treatment is increasingly taken seriously, so the design of an effective control system for wastewater treatment is conducive to environmental protection, but also can make reuse of water resource. However, with the increasingly updates of the modern industrial control technology and network technology, the demands of the actual production of the sewage treatment control system which about reliability, stability, versatility and operational cost become higher, how to design a sewage treatment control system meet the above requirements has a very important practical significance.After in-depth study of ControlNet and OPC technology and the actual inspection of equipments of the project site, according to the network feature of ControlNet and OPC technology, take the idea of centralized monitor and decentralized control, we choice the ControlLogix series PLC of Rockwell company, the S7-200series PLC of Siemens company and Kingview6.53to construct the network platform of sewage treatment control system. Then the thesis introduce the specific design and the method of ControlNet and OPC technology applied to industrial sewage treatment control system, solve the problem about seamless integration of the system,compatibility and stability of communication network very well. Achieve remote operation and monitoring of the status of the whole plant equipments, as well as acquisition, analysis, archiving of various types of data and other functions, the system is well positioned to meet the needs of users in all aspects.The system has been used in the sewage treatment plant of Jingyuan County of Baiyin City, more than six months of the actual operation prove that the system has high stability, high reliability, high efficiency, low operating costs etc, so the system has a good promotional value.Finally, the thesis introduce the whole work brief, analysis the problems in the additional work, and propose the expectation of the future work.