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基于PLC的锅炉温度控制系统

作 者 姓 名 xxx 专 业 自动化 指导教师姓名 xxx 专业技术职务 讲 师

目 录

摘 要 ······································································· 1

第一章 绪论 ························································ 4

1.1课题背景及研究目的和意义 ············································· 4 1.2国内外研究现状 ···························································· 3 1.3项目研究内容 ······························································· 4

第二章 PLC和组态软件基础 ·································· 5

2.1可编程控制器基础 ························································· 5 2.1.1可编程控制器的产生和应用 ·········································· 5 2.1.2可编程控制器的组成和工作原理 ·········· 错误！未定义书签。 2.1.3可编程控制器的分类及特点 ·········································· 7 2.2组态软件的基础 ···························································· 8 2.2.1组态的定义 ······························································· 8 2.2.2组态王软件的特点 ······················································ 8 2.2.3组态王软件仿真的基本方法 ·········································· 8

第三章 PLC控制系统的硬件设计 ······························ 9

3.1 PLC控制系统设计的基本原则和步骤 ······························ 9 3.1.1 PLC控制系统设计的基本原则 ······································· 9 3.1.2 PLC控制系统设计的一般步骤 ······································· 9 3.1.3 PLC程序设计的一般步骤 ··········································· 10 3.2 PLC的选型和硬件配置 ·············································· 11 3.2.1 PLC型号的选择 ······················································· 11 3.2.2 S7-200CPU的选择 ···················································· 12 3.2.3 EM235模拟量输入/输出模块 ······································· 12 3.2.4 热电式传感器 ························································· 12 3.2.5 可控硅加热装置简介 ················································ 12 3.3 系统整体设计方案和电气连接图 ································· 13 3.4 PLC控制器的设计 ···················································· 14 3.4.1 控制系统数学模型的建立 ·········································· 14

3.4.2 PID控制及参数整定 ················································· 14

第四章 PLC控制系统的软件设计 ····························· 16

4.1 PLC程序设计的方法 ················································· 16 4.2 编程软件STEP7--Micro/WIN 概述 ···························· 17 4.2.1 STEP7--Micro/WIN 简单介绍 ······································ 17 4.2.2 计算机与PLC的通信 ················································ 18 4.3 程序设计 ······························································· 18 4.3.1程序设计思路 ·························································· 18 4.3.2 PID指令向导 ·························································· 19 4.3.3 控制程序及分析 ······················································ 25

第五章 组态画面的设计 ············································· 29 5.1组态变量的建立及设备连接 ··········································· 29 5.1.1新建项目 ································································ 29 5.2创建组态画面 ····························································· 33 5.2.1新建主画面 ····························································· 33 5.2.2新建PID参数设定窗口 ·············································· 34 5.2.3新建数据报表 ························································· 34 5.2.4新建实时曲线 ·························································· 35 5.2.5新建历史曲线 ·························································· 35 5.2.6新建报警窗口 ·························································· 36

第六章 系统测试 ···················································· 37

6.1启动组态王 ····························································· 37 6.2实时曲线观察 ···························································· 38 6.3分析历史趋势曲线 ······················································· 38 6.4查看数据报表 ····························································· 40 6.5系统稳定性测试 ·························································· 42 结束语 ·········································································· 43 参考文献 ········································································ 44 致谢 ·············································································· 45