Rockwell Automation Publication 1756-UM004C-EN-P - June 2021 41
Chapter 3 Connect Redundant EtherNet/IP Adapters
Redundant Architecture
Network Considerations
In a star topology with a single switch, if a link is broken between the switch
and the primary redundant adapter, a switchover will occur. With multiple
switches, for example as shown in Figure 11
, if a link is broken between two
switches, a switchover will not occur because the link to the redundant adapter
is still in place.
Figure 11 - Invalid Topology: Network Break does not Cause Switchover
The Primary Adapter does not detect data connection loss on non-directly
connected links. For example in Figure 12
, 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.
Logix5575
Redundancy Module
PRI COM OK
OKFORCE SDRUN
R
U
N
R
E
M
P
R
O
G
R
R
R
Primary
Secondary
To Next Page
Loading...
Need help?
General
