自动供水控制系统设计(PLC)

随着社会经济的迅速发展，人们对供水质量和供水系统可靠性的要求不断提高;再加上目前能源紧缺，利用先进的自动化技术、控制技术以及通讯技术，设计高性能、高节能、能适应不同领域的恒压供水系统成为必然趋势。

本课题用PLC实现了自动供水控制系统，介绍了恒压供水的基本原理以及系统构成的基础，说明了可编程控制器（PLC）在恒压供水系统中所担任的角色。从系统的整体设计方案和实际需求分析开始，紧密的联系实际生活的需要，力求做到使系统运行稳定，操作简便，解决实际中问题，保证供水安全、快捷、可靠。

关键字：PLC恒压供水变频器

ABSTRACT

With the rapid development of social economy, it is demanded the better of water supply’s quality and reliability of water supply system.Meanwhile energy resources are seriously lack. So it is inevitable tendency to design water supply system which has high function and saves on energy well, with help of advanced technique of automation,control and communication. At the same time this system can adapt different water supply fields.

This subject realize the automatic water control system that used of PLC ,it introduced the basic principle that constant voltage supplies water and foundation that the system form , have stated the role served as of the programmable controller (PLC ) in the water -supply system of constant voltage. Since the whole design plan of the system and actual demand are analysed, the need of close life of intergrating with practice, make every effort to make sure to make the system run steadily, easy and simple to handle, solve and hit the problem actually, guarantee to supply water of the security, swift , reliable. Constant voltage has supplied water and guaranteed to support the water quality amount, the control system taking PLC as host computer has enriched the systematic control function, have improved systematic dependability.

Key word: PLC (programmable controller ), Constant voltage, supplies water, Frequency converter

第一章绪论 ........................................................................................................... - 1 -1.1变频恒压供水产生的背景和意义 (1)

1.2变频恒压供水系统的国内研究现状 (1)

1.3本文研究的系统组成和工作原理 (2)

第二章PLC概述 .................................................................................................. - 3 -2.1PLC介绍 (3)

2.2PLC工作原理 (4)

2.3PLC的编程语言 (6)

2.4PLC的分类 (9)

2.5PLC控制系统的结构 (10)

第三章系统硬件的设计 ..................................................................................... - 13 -3.1恒压供水系统的基本构成 (15)

3.2系统控制要求 (17)

3.3控制系统的I/O点及地址分配 (18)

3.4系统选型 (19)

3.5PLC模拟量控制单元的配置以及应用 (19)

第四章系统程序设计 ......................................................................................... - 25 -4.1由“恒压”要求出发的工作泵组数量控制管理 (25)

4.2多泵组泵站泵组管理规范 (25)

4.3程序的结果以及程序功能的实现 (25)

总结 ......................................................................................................................... - 36 -参考文献 ................................................................................................................. - 37 -致谢 ......................................................................................................................... - 38 -