3.2
Redundant Ring Structure
With the aid of an OSM functioning as the redundancy manager (RM), both ends
of an optical bus made up of OSMs can be closed 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, closes the bus if it detects and
interruption and therefore reestablishes a functioning bus configuration. A
maximum of 50 OSMs are permitted in an optical ring. This allows reconfiguration
time of less than 0.3 s to be achieved. The RM mode is activated on the OSM
using a DIP switch (Section 4.2.4.1).
OSM in
RM mode
1 Fiber-optic cable (FOC)
Figure 12: Redundant Ring Structure with OSMs
A redundant electrical ring can be established using ESMs in the same way. To
achieve this the ESMs must be 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.
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-10
OSM ITP 62
OSM ITP 62
1
OSM ITP 62
1
1
Network Topologies with OSM/ESM
OSM ITP 62
OSM TP 62
1
1
OSM ITP 62
OSM ITP 53
1
1
OSM TP 62
1
1
OSM ITP 62
1
31