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。
With the huge benefit for terminal users , fieldbus technology has been resulting in a great change of automation instruments , distributed control system and programmable logic controller in structure and function . however , regardless of domestic or overseas , dcs is still accepted as mainstream devices of process control , the socalled fieldbus control system ca n ' t take place of dcs right away 但是过程控制经过50多年的发展和积累,用户已经在传统的模拟仪表加dcs的体系结构上投入了巨大的资金,无论国内与国外, dcs仍是用于过程控制的主流设备,而且现场总线控制系统在功能上还不能完全取代已经发展得比较完善的dcs 。
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。
An engineer case is introduced , which is about " the reconstruction of high voltage fan ' s speed - adjusting by frequency conversion and the design of plc ( programmable logic controller ) control system in shui cheng iron and steel company " . in this project , an advanced controlling technology , based on the method in this paper , is used to realize the closed loop control of discharge header pressure of two coke ovens 介绍“水钢煤焦化公司鼓风机高压变频调速及系统plc控制改造”的工程概况,对煤气鼓风机采用先进的变频调速技术和计算机控制技术进行改造,实现对两座焦炉集气管压力自动调节的闭环控制功能,既满足了煤气量的自动调节的要求,又避免了煤气鼓风机出口阀门的节流调节,节能效果相当可观。
This paper apply the programmable logic controller which is widely used in industry in old control system of hydraulic table , and use the industry control software to gain the pressure , flux and speed of the experiment , and control the pressure or flux , and portray the curve of experiment 基于此,本课题运用现在工业控制技术广泛使用的可编程控制器来构成原教学实验台控制系统,并结合工控软件mcgs对实验所需的压力、流量和速度进行采集和控制,自动改变实验回路中的压力或流量,得出实验所需的曲线,实现整个实验台的自动控制。
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。