基于PLC的纯水处理系统毕业设计.doc

( 此文档为 word 格式,下载后您可任意编辑修改! ) 基于 PLC 的纯水处理系统 I 摘要本文初步阐述了超纯水生产工艺现状、发展情况和本项目基本情况;重点阐述了超纯水处理 PLC 自动控制系统设计。纯水处理部分包括前处理、制备、抛光及回收系统四个部分。在本控制系统中的,我对分布式输入/输出接口,CPU 选型和冗余系统选择进行设计,本系统选择了 ET200M 分布式 I/O ,它能实现分布广的系统连接,能非常严酷的环境下使用; 机架选择 UR2-H 型,该机架用于在一个机架上配置完整的 S7-400 冗余系统;S7-417-4H 的CPU 功能强大,系统连接和冗余连接方便。软件系统设计部分,为简要说明,对 PLC 常用组态软件的介绍,本文为西门子公司的 STEP 7;文中涉及 STEP 7的应用范围,软件组态设计中所需要的设置的介绍。关键词:超纯水, PLC ,西门子,控制系统 II ABSTRACT In this paper, the initial production process of ultra-pure water the status quo, development and the basic situation of the project; Ultrapure water treatment focuses on the design of automatic control system -pure water includes pre-processing, preparation, polishing and recycling system in four parts. In this control system, I have distributed input / output interface, CPU selection and selection of redundant system design, the system chosen ET200M Distributed I/ O, it can achieve wide distribution system, toa very harsh the use of the environment; UR2-H rack-type choice, the rack used ina rack plete redundancy of the S7-400 system; S7-417-4H powerful the CPU, system connectivity and redundant connections to facilitate . Part of the software system design, for a brief description of the PLC configuration monly used to introduce in this paper for the Siemens STEP 7; text relating to the scope of application of STEP 7, the design of the software configuration settings required for introduction. K eywords : Ultra-pure water, PLC, Siemens , control system 目录摘要.......................................................................................................................................... I ABSTRACT .................................................................................................................................. II 第1章引言.............................................................................................................................. 1 背景..................................................................................