目 录
1 引言 .............................................................................................................................................1
1.1 概述 ....................................................................................................................................1
1.2 设计内容 ...............................................................................................................................1
2 系统功能设计分析和总体思路 .................................................................................................2
2.1 系统功能设计分析 ............................................................................................................2
2.2 系统设计总体思路 ............................................................................................................2
3 PLC 和变频器选取 ......................................................................................................................3
3.1PLC 概述 .................................................................................................................................3
3.1.1 PLC 基本构造 ................................................................................................................3
3.1.2 PLC 工作原理 ................................................................................................................5
3.1.3PLC 型号选取 ..................................................................................................................6
3.2 变频器选取和参数设立 .......................................................................................................6
3.2.1 变频器选取 ...................................................................................................................6
3.2.2 变频调速原理 ................................................................................................................7
3.2.3 变频器工作原理 ............................................................................................................8
3.2.4 变频器迅速设立 ............................................................................................................8
4 开环控制设计及 PLC 编程 .........................................................................................................9
4.1 硬件设计 ..............................................................................................................................9
4.2 PLC 软件编程 ...................................................................................................................10
4.2.1 设计环节 ......................................................................................................................10
4.2.2 系统流程框图 ..............................................................................................................10
4.2.3 程序主体 ........................................................................................................................11
4.2.4 控制程序 T 形图 ............................................................................................................11
5 PLC 系统抗干扰设计 ................................................................................................................17
5.1 变频器干扰源 ..................................................................................................................17
5.2 干扰信号传播方式 ............................................................................................................17
