Sequence For Enabling Media Redundancy - GE PACSystems RX3i User Manual

Chapter 6. Redundant Media
6.5

Sequence for Enabling Media Redundancy

To avoid network loops occurring before the Media Redundancy configuration parameters are stored, the
network must first be set up with the ring broken at one point. Otherwise, packets could continuously cycle on
the network and use up significant network bandwidth. The ring should not be closed until the Media
Redundancy configuration parameters are successfully stored to the Media Redundancy Manager and the
Media Redundancy Manager is operational.
If more than one Media Redundancy Manager is present on the same ring, each PROFINET Controller that is
configured as a Media Redundancy Manager will log a fault in its Local Log and in the RX3i CPU's I/O Fault
Table. When the RX3i configuration is cleared, the Media Redundancy configuration parameters (Media
Redundancy Manager or Client) are kept until a new setting is stored. If power is lost, the Media Redundancy
configuration settings are preserved.
Note: When configuring a Media Redundancy Manager in an open ring, the module may initially report the
ring to be closed. This indication will immediately be followed by a ring open event. This is expected behavior
defined by the MRP specification.
138 PACSystems* RX3i & RSTi-EP PROFINET IO-Controller User Manual GFK-2571N