Description
梯形图编程格式梯形图按行从上至下编写,每一行从左往右顺序编写。PLC程序执行顺序与梯形图的编写顺序一致。图左、右边垂直线称为起始母线、终止母线。每一逻辑行必须从起始母线开始画起,终止于继电器线圈或终止母线(有些PLC终止母线可以省略)。
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