Description
便移入移位寄存器的M20位,此时该位有输出(即输出M20的常开触点闭合信号),建立步1程序,并为步2提供步进条件信号;M20的常闭触点即时断开IN输入端和CP的步1输入端,完成数据“1”输入和移位脉冲输入。从步2起,本步的转步主令信号一发出(X2接通)
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