简介:摘要:现场总线控制系统是自动化领域的发展趋势,随着微处理器和通信技术的发展,控制界也不断在控制精度、可操作性、可维护性等方面提出新需求,现场总线控制系统(FCS,Fieldbus Control System)应运而生。
简介:Thelowlatitudeeasterliesat200hPainsummer(May-October)isanalysedclimaticallyduringthe13-yearperiodfrom1968to1980,withaspecialemphasisontherelationshipsbetweentheanomaloustropicaleasterlyjetStreamoverSouthAsiaandthelowlatitudeatmosphericcirculation,andalsothesummermonsoonprecipitationinIndia.ThecompositinganalysisshowsthatthetropicaleasterlyjetstreamoverSouthAsiahasfiveanomalouspatternsat200hPai.e.thewesternpattern,middlepattern,easternpattern,two-branchpatternandmulti-corepattern.EvidencehasshownthattheprecipitaioninIndiaanomalouslyincreasedduringtheanomalousperiodofthewesternpatternandthemiddlepattern,butreversecaseistrueintheeasternpattern.SomedifferentanomaliesoftheprecipitationindifferentareaofIndiawerefoundduringtheothertwoanomalouspattern.
简介:摘要海上钻井平台OTS600系列变频器主要核心模块为施耐德ATV61变频模块,大多采用CI卡进行本地保护功能和控制逻辑,Profibus-DP卡实现与中央控制柜之间的通讯。现采用西门子S7-200Smart控制器,替换CI卡和DP卡,保留原有控制功能下,节约成本,同时提高了设备运行的稳定性和可靠性。本文重点介绍了控制系统替换原理、硬件组成和系统软件设计。