Publication 1756-UM523F-EN-P - December 2006
154 Set Up EtherNet/IP Communication Across Subnets
Address the Alias Topic in the HMI Project
Keep a Message Going to
the Primary Chassis
If you are not using IP swapping, any controller that sends a message
to a redundant chassis has to point to the new primary chassis after a
switchover.
Sending Message to Primary Chassis
In this procedure, use CIP Generic messages to determine which
chassis is primary. Then send a Message (MSG) instruction to the
primary controller.
When you create tags for your HMI project, use the alias topic in the address of the tag.
E
N
B
T
L
5
5
M
Chassis A
E
N
B
L
5
5
Chassis B
Primary Primary
Switchover
IP Address A IP Address B
E
N
B
T
L
x
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