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目录引言................................................................................................................错误!未定义书签。第一章课题要求.........................................................................................................................21.1设计目的............................................................................................................................21.2控制要求............................................................................................................................21.3设计任务............................................................................................................................2第二章PLC概述..............................................................................................................................22.1PLC简介............................................................................................................................22.2PLC的用途........................................................................................................................32.3PLC的特点........................................................................................................................32.4PLC的分类........................................................................................................................4第三章控制系统总体方案设计.....................................................................................................53.1PLC的体系结构................................................................................................................53.2控制程序流程图设计.........................................................................................................63.2系统变量定义及分配表.....................................................................................................73.3系统接线图设计.................................................................................................................73.3控制系统程序设计思路图..............................................................