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Configuring Networks
3-16
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
3.2.6 Redundant Ring Structure with OLMs
This network topology is a special form of the bus topology. The first and last OLM
are connected together via optical fiber and the ring is therefore closed. Port 5 of
an OLM within this ring structure must be switched to the redundant mode. The
line connected to port 5 then becomes a redundant line that is only used for data
transmission when there is a break in the ring. In contrast to a normal bus
structure, a ring provides increased availability of the network since the data
exchange can be maintained even when an OLM drops out or when the cable is
broken and only the sections affected directly by the problem are segmented.
Note
All OLMs in the redundant ring can only be connected to each other by fiber-optic
cables.
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