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三菱plc中CMP的用法

發布日期:2022-04-26 點擊率:881 品牌:組態王_Kingview

 

   CMP用于16位數據比較,比較的數據范圍是-32768到+32767,比較數據類型可以是常熟K,H等,可以是數據寄存器D,也可以是計數器C,可以是時間繼電器T,還可以是連續的位址(如K1X0,K2Y0,K3M0,K2S0等)。

    指令用法如下:

    CMPD0D2M0

    該指令為比較指令,將比較的結果

    如果D0>D2,M0=1

    如果D0=D2,M1=1

    如果D0<D2,M2=1

    所以使用這個指令會連續占用以M0為首的三個連續的位地址。

    另外,若比較數據范圍大于65535,請使用DCMP,這個是雙字比較指令,用法和CMP一樣,只不過比較的數據都是雙字32位數據,所以使用時不要出現

    DCMPD0D1M0

    這種情況是不對的,因為比較數據D0已經占用了D1和D0,所以這樣寫是錯誤的。

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