1.2 国内外研究现状 ...............................................................................................................1
1.3 恒压供水的基本原理 .......................................................................................................2
1.4 本文设计内容及目标 ....................................................................................................2
第 2 章 恒压供水系统总体设计 ...................................................................................................4
2.1 电机的调速原理 ..............................................................................................................4
2.2 PID 控制原理....................................................................................................................5
2.3 恒压供水系统的技术方案 ..............................................................................................5
2.4 恒压供水的过程 ..............................................................................................................7
第 3 章 系统的硬件设计 ...............................................................................................................9
3.1 PLC 的概述 .......................................................................................................................9
3.1.1 可编程控制器定义及原理 ...................................................................................9
3.1.2 PLC 选型及 PLC 工作方式.................................................................................10
3.2 变频器的概述 ................................................................................................................11
3.2.1 变频器的基本原理及构成 .................................................................................11
3.2.2 变频器的选型及特点 .........................................................................................12
3.2.3 MM440 变频器的使用 ........................................................................................12
3.3 其他设备的选型 ............................................................................................................14
3.4 系统的主电路设计 ........................................................................................................15
3.5 系统的控制电路设计 ....................................................................................................16
3.6 PLC 的 I/O 端口分配及外围电路..................................................................................17
3.6.1 PLC 的 I/O 分配...................................................................................................17
3.6.2 PLC 及变频器的外围接线 ..................................................................................18
第 4 章 系统的软件设计 .............................................................................................................21
4.1 系统程序流程图设计 ....................................................................................................21
4.2 软件设计 PLC 内部元件分配 .......................................................................................25
4.3 PLC 梯形图程序设计 .....................................................................................................25
4.4 力控组态模拟供水过程 ................................................................................................29
4.4.1 力控组态概述 .....................................................................................................29
4.4.2 模拟供水过程 .....................................................................................................30
第 5 章 总结与展望 .....................................................................................................................33
参考文献 .......................................................................................................................................34
致谢 ...............................................................................................................................................35
附录 A 系统电路图......................................................................................................................36
附录 B 主程序梯形图..................................................................................................................39
