The key points of this paper include the design of software and hardware of the system , and the realization of automatic control function . 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 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 ) ,自动监测三联产试验台的各运行参数,并对试验台实行自动控制与调节。
On the basis of the development of field bus in automatically control domain , consulting the characteristic of advanced foreign dredging technology , aiming at the lower automatization level of domestic dredger , this paper introduces a cutter suction dredger monitoring system based on programmable logic controller ( plc ) field network 本文根据自动化控制领域中的现场总线技术的发展情况,结合国外先进的挖泥船技术的特点,针对目前国内挖泥船较低的自动化水平,提出了一种基于plc现场网络的绞吸式挖泥船监控系统。
Power bond graph is used to established the bond graph model of the lifting and dropping of hydraulic pile hammer and state space equation in the paper for hydraulic pile hammer is perplexing nonlinear system . in order to attain the graph that pressure , position , velocity , acceleration vary with time in the course of driving pile simulation procedure solving state space equation is designed on the basis of combining four - order runge - kutta method with predicator - corrector method , dynamic simulation of the hydraulic system is studied in matlab 6 . 5 . it is convenient to analyse dynamic characteristics of the hydraulic syste m , beneficial to the design and parameter optimization of the hydraulic system . in the final part of the paper , under detailed analysis of the control characteristics for double - acting hydraulic pile hammer with double cylinders , control system based on the programmable logic controllers founded on technology of modern compute is designed 由于液压打桩锤液压系统是一个复杂的非线性系统,本文采用功率键合图法建立液压打桩锤上行、下降的键合图模型和状态空间方程,通过四阶龙格?库塔法和预估?校正法相结合编制了仿真程序对状态空间方程求解,在matlab6 . 5中进行液压系统的动态仿真,获得液压打桩锤运动过程中压力、位移、速度、加速度等随时间变化的曲线图。此曲线图方便了对液压系统动态特性分析,为液压系统的设计和参数优化提供了有益的借鉴。最后,在深入分析双缸双作用液压打桩锤控制系统的功能要求后,采用了以现代计算机技术为基础的新型工业控制装置? plc可编程控制器,设计出了双缸双作用液压打桩锤的电器控制系统。
Aiming at the problems of the k190jik rail welding machine , that the parameter modification is difficult , the welding process is not enough stability and the welding machine has no on - line diagnosis function , in this paper , the control system of the welding machine was promoted completely adopting the fx2n - 64mr programmable logic controller and the pcl - 1800 data acquisition card , the das ( data acquisition system ) was set up by using labview and visual basic software , the functions of welding voltage stabilizing and adjusting , current controlling and intellectual modification was improved , welding quality diagnosis system was built up , and the assembling and debugging of the control system was completed , including the process experiments 本文针对k190jik钢轨焊机控制系统存在参数修改困难、焊接过程不够稳定、无焊接质量在线诊断功能等问题,采用日本三菱公司fx2n - 64mr可编程序控制器、研华工控pcl ? 1800数据采集卡等为核心控制部件,对焊机的整机控制系统进行了全面升级。运用软件labview和vb开发了数据采集系统,完善了焊接稳压、调压、电流恒值控制与智能调节功能,利用vb建立了焊接质量在线诊断系统,并完成了系统组装调试与工艺试验研究工作。
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。
A n lh control system structure , based on high speed ethernet , field bus , programmable logic controllers and general purpose pcs , is proposed . after analyses of the key control elements - temperature and composition , the thesis gives detailed design of the main system control functionalities : electrode control system , alloy material adding control system and operation monitoring system 在此基础上,提出了基于工业高速以太网、现场总线、可编程逻辑控制器、通用工业pc的系统结构方案。分析了lf炉的关键要素? ?温度控制和成份调节,对电极控制系统、合金加料系统及操作监控系统等主要控制系统功能进行了详细设计。
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。
The forerunner of teco sa was taian electric , which was founded in march 1969 and merged with teco in oct 2003 . ever since its establishment , sa never stops making contribution towards the industrial automation technology . sas products include ac dc motor controls , molded - case circuit breakers , high low voltage electric material , engines , generators , switchgears , ac dc frequency inverters , programmable logic controllers and servo controllers 电控事业部的前身为台安电机,自1969年3月创立至2003年10月与东元合并迄今,一直秉持着稳健踏实的态度,以电磁开关无熔线断路器高中低压配电器材引擎发电机组配电盘变频器可程式控制器及伺服控制器等产品,为工业发展奉献心力,满足最基础的用电安全,并提供整体性的自动化服务,符合节约能源的世界性潮流。
Abstract : this paper introduces the unavoidable disadvantages of the the marine cargo crane ' s relay - contactor control system and the utilizing of the programmable logic controller ( plc ) and frequency conversion control technology for the marine cargo crane , and describes the main features of the marine cargo crane ' s frequency conversion control system with programmable logic controller such as energy economization and reliable protection 文摘:介绍了传统的船用起货机继电器?接触器控制系统及其存在的问题和可编程控器及交流变频控制技术在船用起货机上的应用,描述船用起货机plc变频控制系统的主要特性,如节能和可靠性保护。
During the designing of the electricity control system , the thesis used the mode that made up of monitor system and control system , formatted a network that is combined by far concentrates control system and nearly control system . the monitor system chooses the functional monitoring software - the king monitor and the man - machine interface , which operated conveniently . and the control system chooses dependably programmable logic controller and advance profibus fieldbus to completely control the spot equipments . author hopes the thesis ' s researches can do a little for the development of the water power control technique , and the combination of the hydraulic technique and the advanced technique , author also hoping heartily the control technique of the our country develop quickly 上位机选用功能强大的工控组态软件? ?组态王和操作方便灵活的触摸屏。下位机则采用可靠性高的可编程控制器和先进的profibus现场总线完成对现场设备的控制。作者希望通过该课题的研究,能够对水电行业控制技术的发展,对液压技术与当今先进技术更好的相结合,起到一定的促进作用,也衷心地希望我国的控制技术取得飞速的发展。