The monitoring and controlling system adopts a total distributed control system ( dcs ) constituted by a programmable logic controller ( plc ) , a computer ( pc ) and thermal power engineering signal sensors , sender , controller , etc . plc is used to collect data and perform automatic control mostly , while pc is adopted to monitor the operation process , analyze , display and store data 本项研究中采用可编程控制器( plc )作下位机、工业控制计算机( pc )作上位机与热工参数测量传感器、变送器、操作控制器等组成集散型控制系统( dcs ) ,上位机和下位机自动监测垃圾焚烧锅炉的各运行参数,并对异重循环流化床垃圾焚烧锅炉实行自动控制与调节。
Abstract : this article retrospects the development of sequence control system in thermal power plants at home and abroad , especially introduces the three developmental stages of sequence control system in china over the past 35 years , i . e . : 1 . starting stage ; 2 . the second stage with programmable logic controller ( plc ) as core hardwares ; and 3 . the third stage with sequence control systems of main and auxiliary equipment incorporated into the distributed control system ( dcs ) and with field bus control system ( fcs ) got involved . this article also appraises the features of sequence control system composed of different configurations and looks forward to the developmental tendency of this system for the next century 文摘:回顾国内、外火电厂顺序控制系统的发展,特别介绍35a来我国顺序控制系统经历的起步阶段、以程序控制器( plc )为核心硬件的中期阶段和主、辅机顺序控制系统融入分散控制系统( dcs )阶段、现场总线控制系统( fcs )介入阶段,并对由不同形式组成的顺序控制系统的特点进行评价,展望下一世纪该系统的发展趋势。
By using optical fiber communication and information transmission based on industrial ethernet , the said system organically combines the industrial automatic control based on programmable logic controller ( plc ) with video supervison , as well as with supervision against thief and fire , having effectively realized the remote monitoring of unattended water pump stations 系统采用光纤通讯和基于工业以太网的信息传输,将基于plc的工业自动控制和视频监控、防火防盗监控有机地结合在一起,实现了对水泵站的远程无人值守监控。
So , in order to resolve those problems above , this paper puts forward some proposals as follows : to establish the computer control system of offshore platform seawater treatment process based on dcs , the industrial programmable logic controllers ( plc ) as the local control layers of the system are applied to control distributing units of the seawater treatment process , and to develop the relevant real - time computer monitoring and controlling system applied to the central control layer to realize all - sided monitoring and controlling for the seawater treatment process , and to realize dynamic simulation . and relevant data management system is developed to realize effective data management 因此,针对该平台水处理工艺所存在的以上问题,本文提出了以下解决方案:为平台的整个水处理工艺构建基于dcs的计算机控制系统,其系统下位采用工业可编程控制器plc实现对过程现场的分散控制,并开发相应的上位实时计算机监控系统实现对整个水处理工艺的全局监控与实时动态模拟,且创建相应的数据管理系统实现对过程现场的工控数据进行有效管理,为平台水处理工艺的静态最优化生产获取资料依据。
Two abb frequency converters and a siemens programmable logic controller ( plc ) are with the lower - level computer and industry computer are with the host computer . the communication between with the host computer and low - level computer not only translate the system condition , but also send the control instruction . the system condition is shown with chinese window in the host computer , and the constant stress function is realized through the frequency converter part 2台变频器和plc作为下位机设备,工控机作为上位机集中控制,上下位机之间通过通讯,把系统当前状态、当前给定通过上位机来综合判断,并通过上位机以汉化界面形式予以显示,而下位机的变频部分则实现管网的恒压功能, plc实现4台水泵机组逻辑控制和定期巡检,及部分故障综合报告。