基于plc的恒压供水系统设计.rar

摘 要

本系统根据现实生产生活中的供水要求，以管道内压力为控制对象，对多个水泵的开关进行总体控制，设计了一套基于PLC的恒压供水系统, 使其能够运行在合理、节能、高效的方式。

本系统主要是通过对供水泵的运转状态进行控制，系统内包含四台水泵。它们组成循环运行方式，运行切换采用“先启先停”的原则。可编程逻辑控制器用于控制各水泵的开关切换来改变供水量，从而保证整个供水管道中的压力维持在一个规定的范围内，可以可靠的实现对供水系统的自动化控制。

本论文首先就恒压供水系统概念、PLC概念等做简单介绍，然后分别对本系统的硬件部分和软件部分的设计做重点分析，以现有理论成果为出发点，力求能解决现实生产生活中的恒压供水问题。

关键词：PLC，自动化，恒压供水

ABSTRACT

In accordance to real life's request, this system uses the water pressure as its control object. It controls some switches of water pumps so that it can form a stable system. This system is based on PLC. We hope that it can run reasonable and efficient.

This system focuses on the running condition of the water pumps. The system contains four pumps. These pumps work in cycle operation. To start first stop is their running principle. PLC controls the switches of these pumps so that it can keep the balance of the volume of water. By this way, the pressure of water can be in a stable range. We can control the water system in the form of automation.

To begin with, this paper explains the concept of constant pressure water and PLC. Secondly, the paper explains the design of the hardware and software of the system. The system is based on existing theoretical basis. I hope that this system can make contribution to dealing with problems of the stable water system.

Key words: PLC, automation, constant pressure

目 录

1引言 1

2恒压供水系统概述 1

2.1恒压供水系统介绍 1

2.2恒压供水系统使用的领域 2

3 PLC概述 2

4恒压供水系统整体分析 3

4.1 PLC应用系统开发流程 4

4.2实现目标 4

4.3解决思路 4

4.4控制需求分析与硬件设计 5

4.5逻辑分析与程序设计 5

4.6总结与评价 6

5恒压供水系统硬件设计 6

5.1明确系统的控制要求 6

5.2分析I/O设备 7

5.3系统控制电路图 7

6软件设计 9

6.1 STEP 7-Micro/WIN编程软件 9

6.2恒压供水系统PLC控制程序 9

6.3程序编译结果 11

7 S7-200 PLC仿真 12

7.1 S7-200 PLC仿真软件简介 12

7.2 S7-200 PLC程序仿真步骤 12

7.3恒压供水系统仿真 13

8结束语 18

参考文献 19

致 谢 20