Research on the Basis of PLC
Process Control System
Abstract： This text has explained mainly that controls the boiler with the method that the course controls, through the configuration and programming, enable system according to the needs of production load, the steam of temperature of supplying certain pressure, make the condition of the safe economy of the boiler run at the same time, realize the control request. In order to improve production efficiency , remain stable and run reliably , offer the convenient supervision method, having adopted PLC and configuration software to control, it is flexible to dispose , control and coordinate , performance is reliable , make the system reach higher automatic level.
The content of the thesis includes to the control system development of the course and survey of the current situation ; Control system operation principle of the course and designing overallly; Describe hardware design , software design detail to make interface , WinCC of Siemens , go to some general designs , location of monitoring system especially, and PLC and going to the communication between the location machines. As the end of the thesis to the conclusion and feeling that are obtained in this design finally. The control of this system is clear and clear, hold the running situation with present system accurately, improve systematic control ability , the operation that the reduced system controls, has lightenned workers' labour intensity; Establishing the important parameter of scene at the same time, what the security system is operated is reliable , reduce the influence operated by mistake at the scene to minimum extent. It is a high-level automatic control system.
The keyword： PLC; Process controlling; Configuration software; WinCC.
目 录
摘 要 Ⅰ
Abstract Ⅱ
第1章 绪 论 1
1.1计算机过程控制系统的发展 1
1.2 PLC控制的发展 2
1.3可编程控制器趋势的发展 2
1.4组态软件的概述 4
1.4.1组态软件的发展趋势 4
1.4.2西门子WINCC的概述 4
1.4.3混合控制系统与组态软件 5
1.5设计的任务与目的 6
第2章 锅炉控制 7
2.1锅炉设备 7
2.2锅炉控制的特点和难点 8
2.3 锅炉的控制系统 8
2.3.1 给水控制系统 10
2.3.2 燃烧控制系统 11
第3章 控制系统的硬件组成 13
3.1 主电路图的设计 14
3.1.1 电路图 14
3.1.2 变频调速原理 14
3.1.2.1 变频器的主电路 14
3.1.2.2 变频调速的优点 15
3.2上位机人机交互设备的选型 16
3.3. PLC及其扩展模块的选型 16
3.3.1 PLC选型 16
3.3.2 SIMATIC S7-300 PLC 17
3.3.3模拟量输出/输入扩展模块 18
3.4现场总线技术 19
3.4.1现场总线技术在锅炉监控系统中的应用 19
3.4.2现场总线技术的基本概念 19
3.4.3现场总线的网络与通信基础 20
3.4.4西门子公司的PROFIBUS现场总线技术 20
3.5传感器 21
第4章 系统软件设计 22
4.1监控系统的任务 22
4.2WinCC组态软件概述 22
4.3系统界面的设计和动作 24
4.3.1组态变量 24
4.3.2创建过程画面 25
4.3.3改变画面的对象属性 27
4.3.4报警记录 28
4.3.5变量记录 30
4.3.6系统总体图 30
第5章 系统调试与运行 32
5.1系统总体结构 32
5.2 系统调试 33
5.2.1连线 33
5.2.2调试 33
第6章 系统的通讯实现 35
6.1现场总线与系统监控软件之间桥梁——OPC 35
6.2视窗控制中心(WinCC)与PLC之间的通讯 36
6.3 S7-300 PLC与WINCC之间的通讯实现 37
结束语 39
参考文献 40
致谢 41
