Rockwell Automation Publication 1756-UM004D-EN-P - August 2022 29
Chapter 3 Connect Redundant EtherNet/IP Adapters
This IP address swap is transparent to the user. You can detect which adapter
the primary adapter is by examining the four character display indicator near
the top of each adapter. On the primary adapter, the network status indicator
is steady green. On the secondary adapter, the network status indicator flashes
green.
Once a swap occurs, the ‘new’ primary adapter remains the primary unless
there is a reason to swap over again. When the previous primary adapter is
reinserted or reconnected, both adapters start the qualification process again
with the adapter that was reconnected becoming the new qualified secondary.
Status Display Codes
Table 7 shows the different Redundant Adapter status codes that can appear
on the adapter.
Adapter Qualification
In a Redundant Adapter configuration, one adapter takes the Primary role and
a second adapter becomes the Qualified Secondary ready to take I/O control
when the primary becomes disqualified.
To complete the qualification process the following conditions must be met.
The modules must:
• have the same firmware revision.
• reside in slots 0 and 1 of the same chassis.
• be initially set to the same IP address.
• have at least one Ethernet port link active.
• be connected to the same Ethernet network.
Table 7 - Primary and Secondary Operation Modes
Status Code Description
PwrUp Power Up/ Unknown
DS Disqualified secondary
QS Qualified secondary
PwQs Primary with qualified secondary partner
PwDS Primary with disqualified secondary
PwNS Primary with no secondary
DSwP Disqualified secondary with primary
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