描述
在进行程序设计时以布尔逻辑代数为理论基础,既以逻辑变量“0”或“1”作为研究对象,以“与”、“或”、“非”三种基本逻辑运算为分析依据,对电气控制线路进行逻辑运算,把触点的“通、断”状态用逻辑变量“0”或“1”来表示具有多变量的“与”逻辑关系表达式可以直接转化为触点串连的梯形图。如图2(a)所示。
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