冗余IP地址每個單元至少存在一個以太網(wǎng)介面，可以通過設(shè)置直接IP地址連接到指定的設(shè)備上?？梢栽谝粚κ滓獑卧蛡溆脝卧性O(shè)置第三個IP地址。這個冗余的IP地址被指定到激活的PLC.上。所有的傳送到冗余IP地址的數(shù)據(jù)(包括冗余IP地址的egd數(shù)據(jù))都有激活的PLC來處理。當(dāng)被激活后，以太網(wǎng)介面總是通過冗余IP來與外界進(jìn)行通訊，而沒被激活的PLC通過直接IP地址來通訊。

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