Description
一旦移位数据移入M20位,便断开步1的输入回路;而从步2开始,每步的输入回路也要串联上一位的常开触点。例如步2的输入回路要串联上一位M20的常开触点。这样,当移位到步2转步主令信号对应的M21位时,便立即断开步2的输入回路。采用这样的移位脉冲输入回路结构
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