描述
这种语言与符号语言有对应关系，很容易互相转换，并便于电气工程师了解与熟悉，故用得很普遍，几乎所有的PLC都开发有这种语言。由于它是用图形表达，小的编程器不好使用它，得有较大的液晶画面的编程器，才能使用它。多数是在计算机对PLC编程时，才使用这种语言。
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