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

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