Siemens ESM - Manual (Page 41)

Network Topologies with OSM/ESM
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-10
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3.4 Compatibility of OSM Version 2/ESM with OSM/ORM
Version 1
Compatibility
Version 2 OSMs can be operated at the same time in the ring with the OSM (6GK
1105-0AA00) and ORM (6GK 1105-1AA00) here called OSM/ORM Version 1.
Make sure that only one device can adopt the redundancy manager function in the
ring; in other words, only one ORM or only one OSM Version 2 operating in the RM
mode.
ORM
OSM ITP 62
OSM
OSM ITP 62
1 1
1
1
1
1 Fiber-optic cable (FOC)
OSM
Figure 16: Ring with ORM as Redundancy Manager