The Researching And Application Of Infranet--Design Of Centralized Monitoring And Controlling Of Assistant System In Laicheng Power Plant In Shandong

With the rapid development of automation, computer and information nerwork,infranet emerged. Infranet is a kind of special LAN. The application of modem comtuter control system promotes the development of infranet greatly. With infranet manufacture process reaches higer automatic level, realizes optimized control and homonized control. The integration of infranet and information network advances the construction of uniform intranet. This paper discusses the inherent characteristics of infranet and the design of switched Entemet theoretically and practically. The resolvents to the problems in the design are discussed. At present, fieldbus as a bottom infranet is developed rapidly, but the most difficult problem that restricts the development of fieldbus is the inconsistent standard and difficult of realizing openness and interoperation. Ethernet coming into field control has been a fact since the rapid development of its techniques. The fieldbus that integrates Ethernet and TCP/IP will be the mainstream and hotspot application as the paper discussed. In order to apply it to industrial field, Ethernet must solve the problem of realtime and interoperation, and integration with fieldbus. In this paper, the fieldbus of ControlNet which meets the former discussed requirments is discussed in detail, and the characteristics excelling other techniques are analyzed including time-critical and realtime and so on. It is the chief fieldbus that constructing RNA with excellent communication capability. The switching Ethernet Infranet will substitute the shared Ethernet Infranet since its excellent performance. The network of centralized monitoring and controlling of assistant system in power plant in LaiCheng of ShanDong province has went to function, and the remarkable benefit has been obtained.