目录摘要..........................................................................-1-1前言.........................................................................-2-2数控机床PLC系统的原理及组成.....................................................32.1PLC系统的介绍...................................................32.1.1PLC在数控机床中的应用形式..................................32.1.2PLC与数控系统及数控机床间的信息交换........................32.1.3PLC在数控机床中的工作流程..................................42.1.4PLC在数控机床中的控制功能..................................42.2PLC系统的原理...................................................52.3PLC系统的组成及各部分功能.......................错误!未定义书签。2.4常见PLC系统的用途................................................73PLC的发展趋势....................................................................83.1PLC微型化发展...................................................83.2PLC网络技术化发展...............................................83.3向模块化、智能化发展.............................................93.4PLC操作向简易化方向发展.........................................93.5编程语言和编程工具的多样化和标准化...............错误!未定义书签。4国内外PLC系统现状...............................................错误!未定义书签。4.1国外发展现状.....................................................94.2国内发展现状.....................................错误!未定义书签。5PLC系统故障分类和故障诊断........................................错误!未定义书签。5.1PLC控制系统故障类型.............................错误!未定义书签。5.1.1外部设备故障...............................错误!未定义书签。5.1.2系统设备故障...............................错误!未定义书签。5.1.3硬件设备故障...............................错误!未定义书签。5.1.4软件设备故障...............................错误!未定义书签。5.2PLC控制系统的故障自诊断................................错误!未定义书签。5.2.1PLC的自诊断测试...........................错误!未定义书签。5.2.2PLC控制系统的故障自诊断...................错误!未定义书签。5.3PLC控制系统故障分布和分层排除....................错误!未定义书签。5.3.1第一层故障.................................错误!未定义书签。5.3.2第二层故障.................................错误!未定义书签。5.3.3第三层故障.................................错误!未定义书签。-1-5.4PLC的日常维护...................................错误!未定义书签。