38 Rockwell Automation Publication 1756-UM004D-EN-P - August 2022
Chapter 3 Connect Redundant EtherNet/IP Adapters
The Primary Adapter does not detect data connection loss on non-directly
connected links. For example in Figure 5, the secondary adapter disqualifies
because it cannot detect the primary adapter.
This action occurs even though the secondary adapter still has a healthy path to
the primary controller.
Similarly, the secondary controller in the redundant controller pair
disqualifies because it cannot detect the primary.
Figure 5 - Invalid Topology: Network Break Results in Loss of Control
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Primary
Primary
Secondary
Secondary
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