目录绪论................................................................................................................................11.PLC的结构、工作原理及系统设计.........................................................................21.1PLC的结构..........................................................................................................21.2PLC的工作原理...................................................................................................31.2.1循环扫描技术................................................................................................31.3PLC的编程语言..................................................................................................31.3.1梯形图语言....................................................................................................41.3.2助记符语言....................................................................................................41.3.3功能块图语言................................................................................................41.4PLC控制系统的构成，设计原则及步骤...........................................................52运料小车控制系统的方案论证.................................................................................72.1运料小车控制系统的控制内容与要求...............................................................72.1.1运料小车的运动流程....................................................................................72.1.2设备控制要求................................................................................................72.2方案论证..............................................................................................................83运料小车控制系统的总体设计...............................................................................103.1硬件设计.............................................................................................................103.1.1PLC外部接线图...........................................................................................103.2软件设计.............................................................................................................103.2.1PLC状态流程...............................................................................................113.2.2系统梯形图..................................................................................................123.3程序的运行调试与仿真.....................................................................................154设计小结...................................................................................................................164.1小车的优缺点分析.............................................................................................164.2设计的改进及推广.............................................................................................16总结............................................................................................................................17参考文献......................................................................................................................18致谢............................................................................................................................19附录......................................................................................
