中工
本科毕业论文(设计)
基于S7-200PLC的双容水箱液位控制器设计
系 (部) 专 业 学 号 学生姓名 指导教师 提交日期
信息工程系 电气工程及其自动化 20107084411 2014年5月22日
摘 要
本论文目的是设计双容水箱液位串级控制系统。在设计中充分利用计算机技术,通讯技术和自动控制技术,以实现对水箱液位的串级控制。首先对被控对象的模型进行分析,并采用实验建模法求取模型的传递函数。其次,根据被控对象模型和被控过程特性设计串级控制系统,采用动态仿真技术对控制系统的性能进行分析。然后,设计并组建过程控制系统,通过S7-200PLC实现对液位的串级PID控制。最后借助数据采集模块﹑西门子触摸屏和数字控制器,设计并组建远程过程控制系统,完成控制系统实验和结果分析。
关键字:液位,模型,PID控制,PLC控制系统
I
Abstract
The purpose of this paper is to design the liquid level's concatenation control system of the double capacity water tank. This design makes full use of the automatic computer technique﹑the communication technique and the automatic control technique in order to realize concatenation control of water tank's liquid. First, I carry out the analysis of the controlled objects' model, and use the experimental method to calculate the transfer function of the model .Next, I Design the concatenation control system and use the dynamic simulation technique to analyze the capability of control system. Afterwards, I design and set up the indicator process control system, realize PID control of the liquid level with S7-200PLC. Finally, I design and set up the long distance computer control system in virtue of the data collection module ﹑Siemens touch screen and digital PID controller,accomplish control system experiment and analyze the outcome.
Keywords: liquid level ,model ,PID control ,computer process control system
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