
Active Components and Topologies
6-18
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Redundant Ring Structure with ESMs
A redundant electrical ring can be established using ESMs in the same way. To
achieve this the ESMs are connected together using ports 7 and 8. One device
must be switched to the redundancy manager mode. With ESMs and a maximum
of 50 devices in the ring, a reconfiguration time of less than 0.3 s can also be
achieved.
ESM ITP 80 ESM ITP 80ESM ITP 80ESM ITP 80
ESM ITP 80ESM ITP 80 ESM ITP 80
ESM ITP 80
2
2
2
2
2 ITP XP standard cable 9/9
2
ESM in RM mode
2
2
ESM ITP 80
22
Figure 6-10 Redundant Ring Structure with ESMs
Note
The reconfiguration time of less than 0.3 s can only be achieved when no
components (for example switches from other vendors) other than OSMs or ESMs
are used in the redundant ring.
In a ring, one device and one device only must operate in the redundancy
manager mode.
DTEs or complete network segments can be attached to ports 1 -- 6 of an
OSM/ESM operating in the RM mode.
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