PLC水箱液位控制设计.doc

基于S7-200PLC的水箱液位控制系统设计
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摘要
随着微处理器、计算机和数字通讯技术的快速发展, 计算机控制系统在工业领域的应用越来越多广泛, 它的重要性也越来越受到人们的肯定。
基于MCGS和S7-200PLC的液位比值控制系统就是组态软件和可编程序控制器(PLC)联合应用的实例。在这个设计中,利用MCGS组态软件对数据、图形进行组态,进而做出上下水箱的动态仿真画面。然后PLC进行数据采集、处理并与MCGS平台进行通讯,从而对液位比值对象进行全面监控。
本设计采用了SIEMENS(西门子)公司的S7-200系列进行程序的编写。将编写正确的PLC程序与在MCGS组态软件下做出的动态界面进行动态连接,在经过检查证明组态的设置没有错误后,进入MCGS的运行环境,可以在MCGS运行环境下看到液位的实时曲线的变化输出情况,随时对水箱的液位状况进行调整和监测。在运行环境中可以通过鼠标在线的改变PID的参数设定值来实现对上水箱的液位调节和控制,使系统达到要求值,从而大大提高了工作效率。
关键词液位比值;PLC;MCGS
Abstract
Along with fast development of the microprocessor,puter and the munication technology, puter control system is more and more widely applied in the field of industry, and its importance is also increasingly affirmed.
Fluid-level-ratio control system based on MCGS and S7-200 PLC is the application bining the configuration software with PLC. In this design, MCGS is applied for data and graphic configuration; there by a dynamic display picture with real-time feature is created. Then PLC acquires and processes data from the sensors, municates with MCGS platform, thus makes the fluid-level-ratio object supervised and controlled totally.
The project uses S7-200, a series of PLC produced by SIEMENS, to make programming. The correct PLC code is dynamically lined to the real-time picture created by MCGS, then switches to MCGS running environment after correct configuration, thus the change tendency of the levels can be viewed on the screen to make the real-time adjustment and supervision of the level. Under running environment, PID parameters will be tuned on line so as to take the best control of the levels of water tanks with the system operating at the given point and high efficiency.
Keywords Fluid-Level-Ratio PLC MCGS
目录
1 绪论 1
PLC的产生、定义及现状 1
PLC的产生、定义 1
PLC的发展现状 1
过程控制的发展 2
本文研究的目的、主要内容 3
本文研究的目的、背景和意义 3
本文研究的主要内容 4
2 西门子S7-200PLC介绍 6
S7-200PLC的结构 6
S7-200PLC的工作原理 7
S7-200PLC上控制算法的介绍 7
3 PLC控制方案设计 9