目 录第 1 章 概述..................................................................11.1 国内外状况及进展趋势..................................................11.2 PLC 的进展历史.........................................................21.3 PLC 进展新动向.........................................................31.4 PLC 的基本结构.........................................................31.5 PLC 的特点.............................................................41.6 PLC 的工作原理.........................................................51.7 PLC 的选型.............................................................6第 2 章 技术参数及方案的设计..................................................72.1 技术参数和条件........................................................72.2 整体方案设计..........................................................7第 3 章 系统的硬件设计及端口分布..............................................83.1 整体框架...............................................................83.2 传感器型号参数........................................................83.3 PLC 电路设计..........................................................103.4 PLC 选型机 I/O 点分配..................................................11第 4 章 程序设计.............................................................134.1 控制要求.............................................................134.2 计数逻辑.............................................................134.3 程序流程图...........................................................144.4 梯形图...............................................................154.5 指令语句表...........................................................19结 束 语...................................................................22致 谢......................................................................23参考文献...................................................................24第 1 章 概述1.1 国内外状况及进展趋势...
