C普通车床控制系统PLC控制程序.docVIP

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C普通车床控制系统PLC控制程序

目 录 引言 ··························································1 1.1 可编程控制器的简单介绍············································1 1.2 西门子S7-200 的简单介绍·········································· 4 1.3 C650卧式车床简述·················································5 继电接触器控制系统设计 ······································7 2.1 C650卧式车床的控制要求···········································7 2.2 电气控制线路分析···················································7 2.3 C650卧式车床电气控制线路的特点····································9 C65O普通车床的PLC 设计过程································10 3.1 控制要求··························································10 3.2 方案说明··························································10 3.3 确定I/O信号数量,选择PLC的类型··································10 3.4 C650普通车床PLC控制系统I/O地址分配表···························11 3.5 控制电路设计······················································11 3.6 PLC控制程序设计··················································13 3.7 C650普通车床控制系统PLC控制程序语句表····························15 3.8 系统调试··························································18 结论····································································19 设计总结·······························································20 谢辞····································································21 参考文献·······························································22 引 言 本设计主要针对C650普通车床进行电气控制系统硬件电路设计,包括主电路、控制电路及PLC硬件配置电路。 1.1 可编程控制器的简单介绍 1.1.1 PLC的工作原理 PLC 英文全称Programmable Logic Controller ,中文全称为可编程逻辑控制器,定义是:一种数字运算操作的电子系统,专为在工业环境应用而设计的。它采用一类可编程的存储器,用于其内部存储程序,执行逻辑运算,顺序控制,定时,计数与算术操作等面向用户的指令,并通过数字或模拟式输入/输出控制各种机械或生产过程。 PLC采用循环扫描的工作方式,即顺序扫描,不断循环这种工作方式是在系统软件控制下进行的。当PLC运行时,CPU根据用户按控制要求编写好并存于用户存储器中的程序,按序号作周期性的程序循环扫描,程序从第一条指令开始,逐条顺序执行用户的程序直到程序结束。然后重新返回第一条指令,再开始下一次扫描;如此周而复始。实际上,PLC扫描工作除了执行用户程序外,还要完成其他工作,整个工作过程分为自诊 断、通讯服务、输入处理、输出处理、程序执行五个阶段。 1.1.2 可编程序控制器的组成 可编程序控制器硬件由中央处理器、电源、输出组件、输入组件、输入输出、编程器六部分构成: 中央处理器( Central Processor Unit 简称CPU):它是可编程序控制

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