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在生产机械的自动控制领域,PLC顺序控制系统的应用量大面广。然而,工艺不同的生产机械要求设计不同的控制系统梯形图。目前,不少电气设计人员仍然采用经验设计法来设计PLC顺序控制系统,不仅设计效率低,容易出差错,而且设计阶段难以发现错误,需要多次调试、修改才符合设计要。本文提出的4种简易设计方法,能快速地一次设计成功PLC顺序控制系统。
顺序控制系统的特点及设计思路
1.特点顺序控制系统是指按照预定的受控执行机构动作顺序及相应的转步条件,一步一步进行的自动控制系统。其受控设备通常是动作顺序不变或相对固定的生产机械。这种控制系统的转步主令信号大多数是行程开关(包括有触点或无触点行程开关、光电开关、干簧管开关、霍尔元件开关等位置检测开关),有时也采用压力继电器、时间继电器之类的信号转换元件作为某些步的转步主令信号。
为了使顺序控制系统工作可靠,通常采用步进式顺序控制电路结构。所谓步进式顺序控制,是指控制系统的任一程序步(以下简称步)的得电以步的得电并且本步的转步主令信号已发出为条件。对生产机械而言,受控设备任一步的机械动作是否执行,取决于控制系统步是否已有输出信号及其受控机械动作是否已完成。若步的动作未完成,则后一步的动作无法执行。这种控制系统的互锁严密,即便转步主令信号元件失灵或出现误操作,亦不会导致动作顺序错乱。
CUTLER HAMMER WESTINGHOUSE FD3100
WESTINGHOUSE 1A 1B Type MC Breaker Auxiliary Switch 1371D72G03
CUTLER HAMMER WESTINGHOUSE FDB Breaker 100A 3P FDB3100
CUTLER HAMMER SNT4RP03K 9-24 VAC VDC L and M Frame Shunt Trip 1493D40G12
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WESTINGHOUSE Type HFB Circuit HFB3050L
EATON CUTLER HAMMER FD3050
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CUTLER HAMMER WESTINGHOUSE A200 Size 5 GCA Starter Coil 440 480 V 2050A14G15
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CHALLENGER WESTINGHOUSE HMCP Motor CHMP003A0
CUTLER HAMMER EHD Circuit Breaker 60 AMP 2 Pole EHD2060L
WESTINGHOUSE HFD Circuit Breaker 3 Pole 70 Amp HFD3070
WESTINGHOUSE FDB Breaker 2 Pole 25 Amp FDB2025
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