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請教各位:在三菱PLC控制伺服電機(jī)時,有時需要原點回歸,但在原點回歸指令ZRN時卻沒有指定運行方向,但是當(dāng)伺服處于原點的負(fù)方向時,它應(yīng)該正轉(zhuǎn)回歸原點;當(dāng)伺服處于原點的正方向時,它應(yīng)該反轉(zhuǎn)回歸原點.是否在運行過程中伺服電機(jī)能判斷在啟動時的初始位置在原點的正反方向?

請問版主如果是控制步進(jìn)電機(jī) ，只用一個光電開關(guān)回原點怎么做
如圖
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