Balluff BNI PNT-502-102-Z078 Konfigurationsanleitung Seite 57

BNI PNT-508-105-Z067 / BNI PNT-508-105-Z077 / BNI PNT-502-102-Z078
Network interface
2
System integration (continued)
Ring topology
The IO-Link master also supports the ring topology with
media redundancy, which is enabled via the Media
Redundancy Protocol (MRP). For this, the module and the
MRP master (Managed Switch, CPU, etc.) must be in the
same topology instance.
With the ring topology, it is possible to establish a
redundant system. I.e. in normal operation, one side of the
ring line from the MRP master is deactivated. If the
line is damaged or capped at one place in the ring, the
deactivated branch is activated again and there are two
linear topologies.
Activating a ring topology
► Set the media redundancy role to Client (the default
setting is Non-subscriber).
Fig. 2-4: Ring topology
To ensure uninterrupted operation, the watchdog time
should be greater than 350 milliseconds, as the MRP
master requires some time to activate the second line. If
the watchdog time is less than the switching time of the
MRP master, this will cause a communication breakdown.
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