冗余IP地址每個(gè)單元至少存在一個(gè)以太網(wǎng)介面，可以通過(guò)設(shè)置直接IP地址連接到指定的設(shè)備上。可以在一對(duì)首要單元和備用單元中設(shè)置第三個(gè)IP地址。這個(gè)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(lái)處理。當(dāng)被激活后，以太網(wǎng)介面總是通過(guò)冗余IP來(lái)與外界進(jìn)行通訊，而沒被激活的PLC通過(guò)直接IP地址來(lái)通訊。

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