
Active Components and Topologies
6-17
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
6.2.5 Redundant Ring Structure
Redundant Ring Structure with OSMs
With the aid of an OSM functioning as the redundancy manager (RM), the ends of
an optical bus made up of OSMs can be connected together to form a redundant
optical ring. The OSMs are connected together using ports 7 and 8.
The RM monitors the OSM bus connected to it at ports 7 and 8 in both directions.
If it detects a break on the bus, it interconnects the ends of the bus to reestablish a
functioning bus configuration. A maximum of 50 OSMs are permitted in an optical
ring. This strategy achieves a reconfiguration time of less than 0.3 seconds.
The RM mode is activated on the OSM using a DIP switch.
1
1
1
1
1 Fiber-optic cable (FO)
1
OSM in RM mode
1
1
OSM ITP62
OSM TP62
OSM TP62
OSM TP62
OSM ITP62
OSM ITP62OSM ITP53
OSM ITP62OSM ITP62
11
Figure 6-9 Redundant Ring Structure with OSMs
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