選擇暑1步進:這下定值為選擇器開關指定一個控制輸入。開關在這個信號的每個上升治轉(zhuǎn)變到一個新位置。位置的改變逐步增加,從最后一個(選擇器1滿程范園)到第一個(位置1)向上覆蓋。這個控制操作數(shù)的連續(xù)脈沖必須快于每50毫秒

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