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PLC流水线产品检测与分选系统设计
目 录
引言··························································3
1 课程设计任务说明···········································4
1.1 课程设计目的·····················································4
1.2 课程设计要求·····················································4
1.3 课题简介·························································5
2 课程设计任务分析··········································5
2.1 机构设备组成分析·················································6
2.2 设备工作过程分析·················································6
3 控制要求分析··············································7
3.1 流水线产品检测与分选系统工作方式要求分析·························7
3.2 流水线产品检测与分选系统自动工作过程要求分析·····················7
3.3 流水线产品检测与分选系统控制元件配置与工作要求分析···············7
3.4 流水线产品检测与分选系统安全稳定工作要求分析·····················8
4 控制方案设计··············································8
4.1主电路设计·······················································8
4.2 PLC选型设计·····················································9
4.3 I/O分配表·······················································10
5 控制流程设计·············································11
5.1 I/O端子接线设计·················································11
5.2 系统控制流程图设计··············································11
5.3 系统梯形图设计··················································12
5.4 梯形图说明······················································14
5.5 指令表设计······················································16
6 结论·····················································18
参考文献······················································19
引言
可编程序控制器（Programmable Logic Controller），简称PLC。他是20世纪70年代以来，在集成电路、计算机技术基础上发展起来的一种新型工业控制设备。由于他具有功能强、可靠性高、配置灵活、使用方便以及体积小、重量轻等优点，国外一广泛应用于自动化控制的各个领域，并已成为实现工业生产的支柱产品，近年来，国内在PLC技术与产品开发应用方面发展很快，除油许多从国外引进的设备、自动化生产线外，国产机床设备已越来越多的采用PLC控制系统取代传统的继电-接触器系统。
PLC用存储逻辑代替接线逻辑，大大减少了控制设备外部的接线，使控制系统设计及建造的周期大为缩短，同时日常维护也变得容易起来，更重要的是使同一设备经过改变程序而改变生产过程变的可能。这特别适合多品种、小批量的生产场合。目前，PLC在国内外广泛应用于钢铁、石油、化工、电力、建材、机械制造、汽车、轻纺、交通运输、环保及文化娱乐等各个行业，使用情况主要分为以下几类∶
开关量逻辑控制
取代传统的继电器控制电路，实现逻辑控制、顺序控制,既可用于控制单台设备,也可用于多机群控及
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