Siemens ESM Operating Instructions Manual page 34

Network Topologies with OSM/ESM
Apart from OSM ITP62-LD modules, all listed OSM variants can be used in any
combination in a bus consisting of OSMs. OSM ITP62-LD modules can only be
coupled with other OSM ITP62-LD modules via the optical ports (monomode fiber).
PC
3
2 ITP XP standard cable 9/9
3 TP cord 9/RJ-45
4 ITP standard cable 9/15
Figure 11: Bus with ESMs
In a bus consisting of ESMs, both ESM ITP80 modules and ESM TP80 modules
can be used. TP and ITP variants can be connected together using the Industrial
Ethernet FastConnect cabling system.
30
S7-400
4
ESM ESM
ITP 80 ITP 80
2
ESM
ITP 80
2 2
S7-300 S7-400
4 4
ESM ESM
ITP 80
ITP 80
2
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-10