Network topologies
3.3 Ring with redundancy manager
SCALANCE X-300
40 Operating Instructions, 05/2016, A5E01113043-20
Properties of a star structure
Each IE Switch X-300 communicates over a TP or FO cable with a central switch with which
all other switches are also connected within a star structure. Communication is possible over
the optical or the electrical ports.
Sample electrical configurations with SCALANCE X310, SCALANCE X-200, SIMATIC S7-
300/400, SIMATIC ET 200, and operator panels as end devices.
Image 3-2 Star structure (electrical)
Ring with redundancy manager
Ring with redundancy manager
To increase availability, linear topologies of up to 100 switches can be closed to form a ring:
● Optical: SCALANCE X-400, SCALANCE X-300, SCALANCE X-200
● Electrical: SCALANCE X-400, SCALANCE X-300, SCALANCE X-200 or ESM
The two ends of the bus are closed to form a ring by a IE Switch X-300 operating as a
redundancy manager. Both the redundancy manager and the other IE switches (redundancy
clients) in the ring must be interconnected via their ring ports (see below).
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