选择暑1步进:这下定值为选择器开关指定一个控制输入。开关在这个信号的每个上升治转变到一个新位置。位置的改变逐步增加,从最后一个(选择器1满程范园)到第一个(位置1)向上覆盖。这个控制操作数的连续脉冲必须快于每50毫秒
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