147 Publication 1756-UM523F-EN-P - December 2006
Appendix
A
Set Up EtherNet/IP Communication Across
Subnets
Introduction
This appendix explains how to keep HMIs and messages pointing to
the primary chassis when IP swapping is not in use.
This appendix provides this information.
Use this appendix when:
• you want to use alias topics instead of IP swapping.
• your primary and secondary chassis are on different EtherNet/IP
subnets
Redundant Chassis Subnets
When primary and secondary chassis are on different EtherNet/IP
subnets, they keep their IP addresses during a switchover. This means
that your and other controllers must be able to switch between the IP
address of each redundant chassis.
Topic Page
Keep an HMI Communicating with the Primary Chassis 148
Keep a Message Going to the Primary Chassis 154
If both redundant chassis are on Then
Different subnets
You must point your HMIs and messages to
the new primary chassis after a switchover.
Use this appendix to show you how.
Same subnet
Stop. Use IP swapping instead. This lets you
use the same IP address regardless of
which chassis is primary.
See Chapter 2.
Switch
Router
Switch
Primary
Chassis
Secondary
Chassis
Switch
Primary
Chassis
Secondary
Chassis
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