Communication Interruption on EtherNet/IP Networks
Brief communication interruption occurs if the connection between RSLinx
Enterprise software 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 a
switchover occurs:
• HMI to redundant chassis pair
• FactoryTalk Batch server to redundant chassis pair
• FactoryTalk Alarms and Events Service to redundant chassis pair
If any alarms are generated while the connection is lost, that data is
buffered. When the connection is re-established, you must acknowledge
the connection loss.
We recommend that the connection bridge between the component and a
redundant chassis pair with an EtherNet/IP network to ControlNet network
path.or exclusive ControlNet connection. This recommendation is valid if your
application requires that the connections that are described previously are
maintained during a switchover.
IMPORTANT The Batch Server detects the lost connection and repeatedly attempts to re-establish
the connection until successful. However, while the connection is lost, the Batch Server
puts the recipes, or entire batch, in the held state.
After the connection between the Batch Server and the redundant chassis pair is
re-established, you can clear the communication failure and restart the recipes. The
Batch Server keeps the recipes in the held state until the failure is cleared and recipes
are restarted.
IMPORTANT I/O connections do not experience delays when a switchover occurs.
