毕业设计论文 - - 水箱液位控制系统的设计 - 图文

毕业设计

课题名称： 基于PLC的水箱液位控制系统设计 设计时间： 2009年 12月 系 部： 电子信息工程系 班 级： ************** 姓 名： ******** 指导老师： ********

摘 要

液位控制是常见的工业过程控制之一，它广泛运用于水塔、锅炉、高层建筑水箱、罐、工业化工槽等受压容器的液位测量。随着科技的进步，人们对生产的控制精度要求越来越高，所以提高液位控制系统的性能显得十分重要。PAC系统是继PLC、DCS之后的新一代控制系统，综合了计算机技术、自动控制技术和通信技术的一种新型的、多功能控制器平台，广泛应用工业控制领域。因此我们很有必要对PAC RX3i液位控制系统设计进行研究。

本设计采用了PACSystems RX3i控制器对水箱液位设备控制进行了系统设计。主控器采用PACSystems RX3i系列的IC695CPU310模块，控制对象为实验室的水箱液位设备，采用以太网进行通讯，用PME软件完成了系统硬件配置，各个模块的的梯形图设计与调试，实现了任意液位高度的手动/自动调节。在系统远程监控方面，利用IFIX软件进行了远程监控界面的设计，通过对液位数据的采集、处理、输出处理，实现了对液位高度的实时监控、自动/手动的无扰切换、报警显示等功能。

本论文分三部分。在简要介绍了PACSystems RX3i系列PLC的硬件模块、工作原理和梯形图等基础知识上，给出了PACSystems RX3i梯形图编程和实验设备的组态，最后通过现场总线（以太网总线）将现场设备和节点连接。实现了液位控制系统的设计。

关键词：液位控制； PACSystems RX3i； 实时监控； 以太网

Abstract

The level control is one of the common industrial process control, it is widely used in cooling towers, boilers, high-rise buildings, water tanks, tanks, industrial chemical tank level measurement of the pressure vessel. With the advances in technology, production control accuracy requirements are high, so to improve the performance of the liquid level control system is very important. The PAC system is following a new generation of PLC, DCS control system, a combination of computer technology, automatic control technology and communication technology, a new, multi-function controller platform, widely used in industrial control field. Therefore imperative that we study the design of the PAC the RX3i level control system. This design uses the PACSystems RX3i controller tank level device control system design. The master control object for laboratory equipment of the Water Level PACSystems RX3i series IC695CPU310 module, using the Ethernet communication, the PME software system hardware configuration, design and debugging of various modules of the ladder to achieve a any level of a high degree of manual / automatic adjustment. IFIX software system RMON RMON interface design, the level of data collection, processing, output processing, the liquid level in the real-time monitoring, automatic / manual bumpless switching, alarm display and other functions. This thesis is divided into three parts. Briefly introduced the PACSystems RX3i Series PLC basic knowledge of the hardware module, working principle and ladder given PACSystems RX3i ladder programming and laboratory equipment configuration, and finally through the field bus (Ethernet bus) field devices and node connections. Level control system design.

Keywords: level control; PACSystems RX3i ; data collection;Ethernet

目 录

摘 要................................................................................................................................. I Abstract ................................................................................................................................ III 目 录.................................................................................................................................... IV 第1章 绪 论........................................................................................................................ 1

1.1 PLC的发展及过程控制简介 ................................................................................. 1

1.1.1 过程控制...................................................................................................... 2 1.1.2 液位控制系统的组成.................................................................................. 2 1.1.3 液位控制系统的功能.................................................................................. 3 1.2 研究意义及发展方向 ............................................................................................. 4 1.3 本论文的主要内容与方法 ..................................................................................... 4 1.4 本论文的结构安排 ................................................................................................. 5 第2章 GE PACSystems RX3i简介 .................................................................................... 6

2.1 GE PACSystem系列PLC概念.............................................................................. 6

2.1.1 PAC概念的提出 .......................................................................................... 6 2.1.1 PAC特征 ...................................................................................................... 6 2.1.3 GE PACSystems............................................................................................ 7 2.2 GE PACSystems RX3i的硬件结构 ........................................................................ 8

2.2.1 GE PACSystems RX3i简介 ......................................................................... 8 2.2.2 GE PACSystems RX3i基本模块 ................................................................. 9 2.2.3 编程设备.................................................................................................... 11 2.3 GE PACSystems系列PLC的工作原理 .............................................................. 11

2.3.1工作原理..................................................................................................... 11 2.3.2 CPU扫描 .................................................................................................... 11 2.4 梯形图编程知识................................................................................................... 14

2.4.1 梯形图的基本概念.................................................................................... 14 2.4.2 梯形图的编程规则.................................................................................... 15 2.4.3 具有自锁功能的程序梯形图.................................................................... 16 2.5 编程环境 Proficy Machine Edition简介 ............................................................ 16

2.5.1 Proficy Machine Edition的安装 ................................................................ 16 2.5.2 制作一个工程的一般过程........................................................................ 17

第3章 组态软件iFix简介 ............................................................................................... 19

3.1 iFix功能 ................................................................................................................ 19

3.2 IFIX的工作机制 .................................................................................................... 19 3.3 IFIX新建工程与配置 ............................................................................................ 19 3.4 工作台 ................................................................................................................... 20 3.5 数据库管理器 ....................................................................................................... 21 第4章 基于GE PAC RX3i液位控制系统设计 .............................................................. 22

4.1 PID理论知识 ........................................................................................................ 22

4.1.1 PID控制器 ................................................................................................. 22 4.1.2 模拟PID控制原理 ................................................................................... 22 4.1.3 数字PID控制算法 ................................................................................... 24 4.2 系统控制原理 ....................................................................................................... 25 4.3硬件连接................................................................................................................ 25 4.4 软件设计 ............................................................................................................... 27

4.3.1 主程序模块................................................................................................ 28 4.3.2 初始化模块................................................................................................ 29 4.3.3 PID程序 .................................................................................................. 29

第五章 基于IFIX的液位监控系统的设计 ...................................................................... 32

5.1 监控系统的设计................................................................................................... 32

5.1.1 创建IFIX系统工程 .................................................................................. 32 5.1.3 创建组态画面............................................................................................ 33 5.1.4 构造数据库................................................................................................ 34 5.2 运行与调试........................................................................................................... 36

5.2.1 通讯的调试................................................................................................ 36 5.2.2 数据连接的调试........................................................................................ 36 5.2.3 PID比例、积分、微分参数值整定 ......................................................... 37

结 论.............................................................................................................................. 43 参考文献.............................................................................................................................. 45

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