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高速計數器的硬件接線應注意什么問題?

發布日期:2022-04-27 點擊率:31


  高速計數器的輸入回路電壓一般是DC 24V,編碼器的輸出電壓應與之相同。選型時應注意編碼器的輸出電路類型,是NPN管還是PNP'管,是吸收電流還是輸出電流,與PLC的輸入電路是否匹配,選型時應力求編碼器的輸出端可以直接與PLC的輸入電路相連。

    小型PLC用于高速計數器的輸入端子個數有限,例如FX2N只有6個,而1個高速計數器最多有4個輸入信號(兩個計數脈沖信號、一個復位信號和一個啟動信號),因此實際上是多個高速計數器共用有限的輸入端子,具體的端子分配可以查閱PLC的用戶手冊。


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