目录第1章引言........................................................................................................................11.1设计概述..........................................................................................................................11.2设计目标与意义..............................................................................................................11.3章节安排..........................................................................................................................2第2章方案论证与选型........................................................................................................32.1设计任务分析..................................................................................................................32.2方案论证与选择..............................................................................................................32.2.1方案一.......................................................................................................................32.2.2方案二.......................................................................................................................32.3方案确定..........................................................................................................................3第3章硬件电路设计............................................................................................................43.1可编程序控制器简介......................................................................................................43.2PLC的结构.......................................................................................................................43.3PLC的主要功能...............................................................................................................53.4PLC的特点.......................................................................................................................63.5PLC的发展状态和趋势...................................................................................................7