基于PLC过程控制系统设计

电气自动化论文编号:ZD472  论文字数:22002,页数:47，有开题报告，任务书，文献综述

目   录

摘  要  Ⅰ
Abstract Ⅱ
第一章 概述 1
 1.1 过程控制发展及现状 1
 1.2 PLC控制的发展及其在过程控制的应用 2
 1.2.1 PLC的发展及现状 2
 1.2.2 PLC在过程控制中的应用 4
 1.3 组态软件的概述 4
 1.3.1 组态软件的发展趋势 4
 1.3.2西门子WINCC的概述 5
 1.4设计的任务与目的 7
第二章 传统锅炉控制方案介绍 7
 2.1锅炉设备概述 7
 2.2 锅炉控制方案介绍 8
 2.2.1水位控制系统 9
 2.2.2燃烧控制系统 11
第三章 系统硬件部分的设计 11
 3.1 主电路图的设计 12
 3.2 变频器的介绍 12
 3.2.1变频调速的基本原理 12
 3.2.2变频调速的优点 13
 3.3控制电路设计 13
 3.3.1确定PLC的输入输出信号 14
 3.3.2 PLC的选型 15
 3.3.3西门子S-300PLC的特点 19
 3.4现场总线的3概述 19
 3.4.1现场总线的发展史和趋势 19
 3.4.2现场总线的特点 21
 3.5传感器 22
第四章 系统软件部分的设计 23
 4.1创建一个新项目 23
 4.2 硬件组态程序 26
 4.3程序编写 27
 4.3.1程序语言介绍 27
 4.3.2 STEP 7 中的模块 30
 4.4程序清单 30
 4.4.1运行参数初始化 35
 4.4.2燃烧器控制 31
 4.4.3给水泵的控制 31
 4.4.4通讯程序 32
 4.45燃烧器熄火故障 33
 4.4.6处理余热锅炉水位极低故障、工作油位低故障 33
第五章 系统调试 34
 5.1调试过程 34
 5.2调试说明 34
总结 37
参考文献 39
致谢 40

摘  要：可编程序控制器(PLC，programmable Logic Controller)因其高可靠性和较高的性价比，而在工业控制中被广泛应用。监控组态软件也是自80年代后期伴随个人计算机的普及而迅猛发展起来的。它以其具备的实时多任务、接口开放、使用灵活、功能多样、运行可靠等特点而具有很强的实用价值。
 该项目采用的是德国Siemens公司的S7-300系列PLC，运用与之相配的STEP7编程软件，通过LAD编程语言编制了下位机的控制程序。采用了同是Siemens公司的Wincc组态软件对上位机监控软件组态，实现现场数据实时记录和监控，设计了记录查询、报警、实时模拟等具有Windows风格的动态操作画面。
 锅炉是工业生产的重要设备,其耗能大,应用广泛,对其安全、节能等方面进行控制具有重要的意义。
 现场调试和运行表明，本文设计的控制系统实现了锅炉燃烧过程的自动控制，有效地降低了能耗，提高了生产管理水平。系统安装维护方便，运行稳定、可靠;监控软件功能齐全，人机界面友好，使用方便。
关键词: 可编程序控制器，组态软件，监控，现场总线
 

Control the Design of the System According to the PLC Process
Abstract：Programmable logic controller because of its high dependability and higher cost performance their, wide to suffused with application in industrial control. Control configuration software to follow popularization of personal computer and develop will it be later stage the eighties rapidly too. With real-time many tasks, interface open, flexible in usage, various operating characteristics such as being reliable and having strong practical value very function that possess there it.
 With the Siemens PLC 57--300 and the corresponding Programming softwareSTEp7, that helps in control software programming. Have made the control procedure of the next machine through LAD programming language. The design work uses Wincc, that 15 also a Product from Siemens to configure. The supervisory software, realizing tile real--tilde data—logging, supervising and Controlling, as well as various visual HMI with Windows features such as real--time Weighing, record checking, alarming, dynamic simulation.
 The boiler is the important equipments that the industry produces, it consumes the ability big, application extensively, as to its safety, and economy energy etc. carries on control to have the important meaning.
Adjust to try and circulate the enunciation on the scene, the control system of this text design carries out the boiler to burn the automatic control of the process, lowering availably can consume, raising the production control level. The system installs the maintenance convenience, circulate stability, credibility; supervision the software function is well-found, man-machine interface amity use the convenience.
Keywords：Programmable controller， configuration software，Proportioning，
            supervision and control，