毕业设计（论文）-PLC两种液体混合系统设计.doc

毕业设计-两种液体混合系统设计
摘要
可编程序控制器简称PLC,是近年来一种发展极为迅速,应用极为广泛的工业控制装置。它是一种专为工业环境应用而设计的数字运行的电子系统,它采用可编程程序的存储器,用来存储用户指令,通过数字或模拟的输入/输出完成确定的逻辑顺序、定时、记数、运算和一些确定的功能来控制各种类型的机械或生产过程。
由于PLC的性能优越,兼具计算机的功能完备,灵活性强,通用性好和继电接触器控制简单易懂,维修方便等优点,形成以微电脑为核心的电子控制设备。可编程序控制器技术在世界上己广泛应用,成为自动化系统中的基本电控装置PLC在现代工业生产和实际生活中有着广泛的应用,由于可编程控制器(PLC)具有编程梯形图语言易学易懂、控制灵活方便、抗干扰能力强、运行稳定可靠等特点,现在的工业自动化生产控制多采用可编程控制器来实现。
本论文首先介绍PLC的产生和发展及应用,以及它的基本功能和特点。然后鉴于PLC的原理及其优越性,应用PLC控制液体的自动混合,该程序可进行单周期或连续工作,正常工作时,至少完成一个周期,该程序具有一定的防止误动作能力。本论文从硬件设计,软件设计,组态王监控设计等方面进行分析,对西门子S7-200的应用有一定的指导意义。
关键词:可编程控制器 ,   液体混合装置, 传感器

Design of liquid mixing control system based on PLC
ABSTRACT
Programmable logic controller is called PLC for develops fastly,and has a wide use as industricial controlling is a electronic system which oporates digitally,and it is designed for industrial enviroment application. The memory it adopts is programmable,and it stores user the digital or anolog input/output,PLC can wok by set logic sequence,can time ,can count,can operate, and plete other else it can control all kinds of mechanical procejures and production procejures.
Because of its high performance ,mutiple functions like puter,high flexibility,monality,simple and pellucid relay-contactor controlling,easy mantainace and other else merits, people begin to take pute as the core controlle to control the electronic equipment . PLC was widely used all around the world..Owing to its easy-to-learn and easy-to-undersdand ladder diagram programmable languge,flexible and convenient controlling methods,good capacity of resisting disturbance,reliable operaion and so on features , PLC is extensively used in industricial automatic production.
This passage firstly introduces the production,the development of Programmable Logic Controller( Called PLC for short), and its basic function and to its main principle and excellent quality,we can use PLC to control the mixing of two kinds of l