Setting Up Media Redundancy Protocol; Media Redundancy Setup For A Profinet Io-Controller; Sequence For Enabling Media Redundancy - GE PACSystems RXi User Manual

Setting Up Media Redundancy Protocol

11.5
Media Redundancy must first be set up in the hardware configuration of all devices on the
ring. Parameters for configuring Media Redundancy using Proficy Machine Edition are
described in Media Redundancy Tab on page 51.
For port locations, refer to Section 1.3, RXi Controller User Features.

11.5.1 Media Redundancy Setup for a PROFINET IO-Controller

A PNC can be configured as either a Media Redundancy Manager (MRM) or a Media
Redundancy Client (MRC). Only one device on the ring can be configured as the Media
Redundancy Manager. All other devices on the ring must be configured as Media
Redundancy Clients.
By default, Media Redundancy is disabled for the PNC. To be used, it must first be enabled
and set up in the configuration.
Configuring a Media Redundancy Manager includes specifying a test interval and retry count
for ring failure checking. It also includes specifying which of the PNC's switch ports are
connected to the ring.
The PNC stores the current Media Redundancy Protocol configuration settings in non-volatile
storage so it can configure the switch port appropriately at power-up. The PNC disables all its
external Ethernet ports until it has retrieved and applied the Media Redundancy Protocol
configuration from its non-volatile storage.

11.5.2 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 PNC that is
configured as a Media Redundancy Manager will log a fault in the CPU's I/O Fault Table.
When the hardware 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:
GFK-2816F
When configuring a Media Redundancy Manager in an open ring, the PNC 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.
Chapter 11. PROFINET Redundant Media
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