【作者】 程浩；

【导师】 汤伟；

【作者基本信息】 陕西科技大学 ， 化工过程机械， 2013， 硕士

【摘要】 计算机仿真实验系统是实验教学的理想平台。目前，我国高校因扩招而出现实验教学与理论教学比例失衡的问题，且现有自控原理实验设备已不能满足过程控制仿真要求。针对这一现状，本文在对国内外仿真实验室建设和使用情况分析的基础上，以我校轻工与能源学院过程装备与控制工程专业学生为应用对象，结合所需仿真的实验内容，设计并搭建了一套基于西门子S7-300PLC的计算机综合仿真实验系统，旨在建成一个适用范围广、建设成本低的仿真实验室，有效缓解实验教学的压力。本文主要研究工作和贡献可总结如下。1)确定系统建设方案，并对关键技术进行研究。在分析计算机仿真实验室国内外动态的基础上，本文重点研究了建设基于西门子S7-300PLC的计算机综合仿真实验系统所包含的各项关键技术，包括PROTEL、西门子S7-300PLC、WINCC、STEP7、OPC、MPI和控制理论等相关知识。2)仿真实验系统的搭建。通过对关键技术的运用，设计和制作了系统所需的控制柜和实验箱等设备，并建立了各上位机、服务器与PLC、PLC与实验箱之间的硬件连接。3)绘制监控画面、编写程序及调试系统。利用WINCC与STEP7，进行硬件组态、参数设置、监控画面绘制和用户程序编写；通过MPI和OPC通讯技术建立各上位机、服务器与PLC之间的通讯连接；对系统进行运行和调试。4)实验内容的设计与实现。设计《控制工程基础》和《复杂过程控制系统》相关实验的基于RC网络的模拟电路，并将各实验的模拟电路搭接在实验箱上进行仿真。利用MATLAB软件得出相同实验在相同参数设置下的仿真结果，并与本实验系统的仿真结果进行对比，表明本实验系统的仿真效果是较为理想的。撰写实验指导书。本课题的创新之处在于：1)通过搭建基于西门子S7-300PLC的计算机综合仿真实验系统，创建了一个更接近工业现场的过程控制仿真平台。2)本系统建设成本低。它运用MPI和OPC等多种通讯技术，使得一套系统中多台上位机能共用一张通讯卡与PLC相连而各自能同时独立地完成实验，这样减少了大量实验设备的投入，系统建设成本能够降低约三分之二。3)本系统适用范围广。它能够包含《控制工程基础》和《复杂过程控制系统》的相关实验，并且为各控制方式设计了基于RC网络的模拟电路，使得实验者能更方便快捷地完成实验。更多还原

【Abstract】 The computer simulation system is an ideal platform for experimentalteaching. At present, the ratio imbalance of our experimental and theoreticalteaching is ubiquitous in universities because of the constant expansion. Andactual automatic control experimental equipments cannot meet the need of thesimulation of process control. According to the situation, connecting with theexperimental contents need to be simulated, a set of computer comprehensivesimulation system based on SIEMENS S7-300PLC (hereinafter abbreviated assystem) is designed and built on the basis of analysis of domestic and foreigncurrent construction and running of simulation lab. Its application object is thestudents, who major in process equipment and control engineering in LightIndustry and Energy College. The goal of this paper is to build a simulation labwith wide application scope and low cost, by which the stress of experimentalteaching can be received effectively.The main research work and contributions of this thesis are summed up asfollows.I. The construction scheme of the system was designed and the keytechnologies were studied. Based on analysis of the system both at home andabroad, the key technologies of the system based on SIEMENS S7-300PLC areanalyzed seriously, such as PROTEL, SIEMENS S7-300PLC, WINCC, STEP7,OPC, MPI, control theory, etc.II. A complete set of system was established. Control cabinet, experimentalbox and other devices were designed and made through the application of keytechnologies. The hardware connections between upper computers, PLC andsever, PLC and experimental boxes were built simultaneously.III. Monitoring pictures drawing, programming and system debugging wereaccomplished. WINCC and STEP7were used for hardware configuration,parameter setting, monitoring pictures drawing and programming. Communications between upper computers, PLC and sever were established byMPI and OPC. And then, the system was run and debugged.IV. Experimental contents were designed and implemented. Analog circuitsbased on RC net were designed for Control Engineering Fundamentals andComplicated Process Control System. Then they were linked in the box tosimulate. Comparing with the results obtained from MATLAB simulations in thesame condition, the system operated as expected. And accordingly theexperiment instructions were written.The innovations of this paper are as follows:I. A process control simulation platform, whose simulations are quite near tothe results from industrial field, was built based on SIEMENS S7-300PLC.II. This system is of low cost. Because MPI, OPC and many othertechnologies are applied, multiple computers can connect to one PLC by onecommunication card, and every computer can accomplish their experimentssimultaneously and independently without disturbing in each other in one suit ofthe system. Thus utilization of experimental facilities can be decreased quitemuch and construction cost of the system can be reduced about two-thirds.III. This system is of wide application range. Because it includes allexperiments of Control Engineering Fundamentals and Complicated ProcessControl System, and the RC net analog circuits are designed for every controlmethod, experimenters can accomplish experiments more conveniently andefficiently.更多还原