范文编号:ZD160 包括CADL图,外文翻译,范文字数:49725,页数:107 S7-200PLC 摘 要 随着火电机组向大容量、高参数发展,机组在起停中需要监控的项目不断增加。可以设想,如此繁多的辅机、阀门若由电厂运行人员手动操作,是难以完成机组的起停工作的,甚至导致事故的进一步扩大。由此可见,在大中型电厂应普遍进行顺序控制。机组顺序控制系统的英文全称是Sequential Control System,简称SCS。SCS包括主机的顺序控制和机组外围设备的顺序控制。机组主机的顺序控制可由可编程序控制器(PLC)实现,也可由集散控制系统实现。
关键词:PLC; 化学水处理; 控制系统
ABSTRACT With thermal power machine group to High Capacity, high parameter extend, needs for supervisory item of machine group at on-off are increasing without intermission . Imagining,if power plant operator operate so multitudinous auxiliary and valve only by hands, it is so difficult to finish machine team's on-off working, even result in more expanding of accident.We see, therefore,at cleanness defect type power plant should proceed prevalence sequential control.It's full name in english is sequential control system , that of machine group sequence control system ,for short scsScs include mainframe's sequential control and machine group peripheral equipment's sequential control .The sequential control of the machine group mainframe can realize not only by programmable controller(plc)but also by total distributed control system . Keywords:plc; chemical water treatment; control system
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