Description
该步进阶梯结构的特点是每步的辅助继电器都有一个置位线圈和一个复位线圈,二者编号相同。步1利用置位指令S使辅助继电器M1置位(即M1线圈得电后内部自锁),建立步1程序,并为步2提供步进条件信号。当步2的转步主令信号发出(X2闭合),指令S使M2置位,
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