描述
在PLC的编程语言中，梯形图是最为广泛使用的语言，通过PLC的指令系统将梯形图变成PLC能接受程序，由编程器键入到PLC用户存储区去。而梯形图与继电器控制原理图十分相似，主要原因是PLC梯形图的发明大致上沿用户继电器控制电路的元件符号，仅个别处有些不同。
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