目录摘要第1章引言............................................................................................................11.1设计概述..........................................................................................................11.2设计目标与意义..............................................................................................11.3PLC的系统的组成...........................................................................................21.4章节安排..........................................................................................................6第2章方案论证与选型............................................................................................72.1设计任务分析....................................................................................................72.2方案论证与选择................................................................................................72.2.1方案一.........................................................................................................72.2.2方案二.........................................................................................................82.3方案确定............................................................................................................9第3章硬件电路设计..............................................................................................113.1原理分析..........................................................................................................113.2实物电路总体框图..........................................................................................113.3原理图..............................................................................................................123.4PCB布局布线...................................................................................................13第4章软件设计......................................................................................................144.1软件总体设计........................................................................................