DNBI P0970BC
DNBI P0970BC
DNBI P0970BC
PLC控制取代继电器控制已是大势所趋，如果用PLC改造继电器控制系统，根据原有的继电器电路图来设计梯形图显然是一条捷径。这是由于原有的继电器控制系统经过长期的使用和考验，已经被证明能完成系统要求的控制功能，而继电器电路图又与梯形图有很多相似之处，因此可以将继电器电路图经过适当的“翻译”，从而设计出具有相同功能的PLC梯形图程序，所以将这种设计方法称为“移植设计法”或“翻译法”。
在分析PLC控制系统的功能时，可以将PLC想象成一个继电器控制系统中的控制箱。PLC外部接线图描述的是这个控制箱的外部接线，PLC的梯形图程序是这个控制箱内部的“线路图”，PLC输入继电器和输出继电器是这个控制箱与外部联系的“中间继电器”，这样就可以用分析继电器电路图的方法来分析PLC控制系统。
我们可以将输入继电器的触点想象成对应的外部输入设备的触点，将输出继电器的线圈想象成对应的外部输出设备的线圈。外部输出设备的线圈除了受PLC的控制外，可能还会受外部触点的控制。用上述的思想就可以将继电器电路图转换为功能相同的PLC外部接线图和梯形图。
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