冗余IP地址每个单元至少存在一个以太网介面，可以通过设置直接IP地址连接到指定的设备上。可以在一对首要单元和备用单元中设置第三个IP地址。这个冗余的IP地址被指定到激活的PLC.上。所有的传送到冗余IP地址的数据(包括冗余IP地址的egd数据)都有激活的PLC来处理。当被激活后，以太网介面总是通过冗余IP来与外界进行通讯，而没被激活的PLC通过直接IP地址来通讯。
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