描述
梯形图与流程图混合语言。这种语言，梯形图与流程图两者兼用，可使PLC程序结构化。它用流程图把PLC程序划分成若干结构块，并规范块间的逻辑联系。用梯形图再确定块中的种种量间的逻辑关系。这种混合语言有不同的实现方法，而且多用于大型的PLC的编程
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