GE IC695PNC001 User Manual page 111

6
For bumpless network recovery (without disturbing IO communications to an IO-Device), the Update
Rate for the IO-Device should be configured to be greater than 1/3 of the network recovery time.
This permits the ring to be disconnected or reconnected without timing out the communication
connection between the IO-Device and its IO-Controller.
1000Base-T SFPs can introduce significant network recovery time. For best MRP performance with
a 10/100/1000 Mbps copper Ethernet MPR ring network, configure the RX3i PNC's MRP ring ports
as the RJ-45 Ethernet ports (Ports 1 and 2) instead of SFP ports (Ports 3 and 4) with 1000Base-T
SFPs.
GFK-2571A Chapter 6 Redundant Media 6-3