36 Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
Chapter 2 Design an Enhanced Redundancy System
IP Address Swapping
EtherNet/IP communication modules can use IP address swapping to swap IP
addresses during a switchover. You must use this feature to use Ethernet I/O
connections.
For more information on IP address swapping, see Chapter 5
, Configure the
ControlNet Network on page 93.
Unicast Functionality
Enhanced redundancy systems support unicast produced tags. Unicast consumed
tags are not supported in enhanced redundancy systems. Unicast I/O is not
supported in a redundancy system.
Possible Communication Delays on EtherNet/IP Networks
Brief communication delays can occur for certain connection types if the
connection between a component and the redundant chassis pair uses a path
exclusively over an EtherNet/IP network and a switchover occurs. After the
switchover is complete, communication resumes automatically.
These connection types can experience the communication delay when the
switchover occurs:
• HMI to redundant chassis pair
• FactoryTalk Batch server to redundant chassis pair
• FactoryTalk Alarms and Events Service to redundant chassis pair
Bridge from an EtherNet/IP network to a ControlNet network if you must
maintain the connection between the component and a redundant chassis pair in
the event of a switchover.
See HMI Blind Time Reduction on Ethernet During a Switchover on page 21
.
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