IC200PNS002單路脈沖輸入的外部方向控制加/減計(jì)數(shù)。即有一個(gè)脈沖輸入端,有一個(gè)方向控制端,方向輸入信號(hào)等于1時(shí),加計(jì)數(shù);方向輸入信號(hào)等于0時(shí),減計(jì)數(shù)。如圖2所示外部方向控制的單路加/減計(jì)數(shù)。兩路脈沖輸入的雙相正交計(jì)數(shù)。即有兩個(gè)脈沖輸入端,輸入的兩路脈沖A 相、B相,相位互差90°(正交),A 相超前B相90°時(shí),加計(jì)數(shù);A 相滯后B相90°時(shí),減計(jì)數(shù)。在這種計(jì)數(shù)方式下,可選擇1x 模式(單倍頻,一個(gè)時(shí)鐘脈沖計(jì)一個(gè)數(shù))和4x 模式(四倍頻,一個(gè)時(shí)鐘脈沖計(jì)四個(gè)數(shù))。
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