摘 要.............................................................................................................................................................I
ABSTRACT...............................................................................................................................................II
第一章 绪论................................................................................................................................................1
1.1 引言...................................................................................................................................................1
1.2 PLC概述............................................................................................................................................2
1.3本文的主要工作................................................................................................................................3
第二章 温度控制系统理论设计................................................................................................................4
2.1 模拟量闭环控制的基本概念...........................................................................................................4
2.1.1
模拟量闭环控制系统的组成
....................................................................................................4
2.1.2
闭环控制的主要性能指标
........................................................................................................5
2.2 PID 原理............................................................................................................................................5
2.2.1 PID
(
Proportional, Integral and Derivative
)简介
.................................................................5
2.2.2 PID
控制算法
.............................................................................................................................6
2.2.3 PID
参数的整定方法
.................................................................................................................6
2.2.4 PID
参数工程整定法
.................................................................................................................7
2.2.5 PID
各参数在系统中的作用
...................................................................................................10
2.3 温度控制系统概述.........................................................................................................................11
2.3.1
温度控制系统工作原理
..........................................................................................................11
2.3.2
系统要求
..................................................................................................................................11
2.3.3 PLC
控制系统的构成
...............................................................................................................11
第三章 硬件系统设计..............................................................................................................................12
3.1 总体方案.........................................................................................................................................12
3.2 硬件系统方案设计.........................................................................................................................13
3.3 控制器的选择.................................................................................................................................13
3.4 信号采集与变换.............................................................................................................................15
3.5 执行模块.........................................................................................................................................18
3.5.1
固态继电器
..............................................................................................................................18
3.5.2
加热器
......................................................................................................................................19
第四章 软件系统设计..............................................................................................................................20
4.1 S7-300实现PID闭环控制的方法...................................................................................................20
4.2 连续PID控制器...............................................................................................................................20
4.2.1
设定值与过程变量的处理
......................................................................................................21
4.2.2
控制器输出值的处理
..............................................................................................................22
4.3 系统实现与PLC编程......................................................................................................................23
4.3.1
软件编程方框图
......................................................................................................................23
4.4 调试结果.........................................................................................................................................25
第五章 系统安装......................................................................................................................................27
第六章 结束语..........................................................................................................................................28
6.1 本文总结.........................................................................................................................................28
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