张家界航空工业职业技术学院毕业设计说明书目录第1章引言.................................................................................................................................21.1设计概述.................................................................................................................................21.2设计目标与.............................................................................................................................21.3章节安排.................................................................................................................................3第2章方案论证与选型.................................................................................................................42.1设计任务分析.........................................................................................................................42.2方案论证与选择.....................................................................................................................42.3方案确定..................................................................................................................................4第3章硬件电路设计.....................................................................................................................53.1可编程序控制器简介.............................................................................................................53.2PLC的结构..............................................................................................................................53.3PLC的主要功能......................................................................................................................63.4PLC的特点..............................................................................................................................73.5PLC的发展状态和趋势..........................................................................................................83.6接线图....................................................................................................................