
Configuring Networks
3-21
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
OLM
5
ELM
OLM
6
OLM
7
OLM
2
OLM
3
OLM
4
OLMOLM
ELM
OLM
1
ASGE
400 m 250 m
100 m
80 m
50 m
300 m200 m100 m
300 m
100 m
4
5
Redundant
line
Port 5 in the
redundant mode
Node 1
Node 3
2
3
1. ITP standard cable 9/15
2. TP cord 9/RJ45
3. ITP XP standard cable 9/9
1
1
1
2
3
3
3
Node 4
6
4
4
5
6
6
4. 727-1 drop cable
5. Triaxial cable
6. Fiber-optic cable (FO)
Node 2
Node 5
OSM ITP62
OSM ITP62
OSM ITP62
Figure 3-7 Combination of OLMs and Star Couplers
If redundant OLM rings are connected to a star coupler as shown in the example,
this ring must be segmented to a worst-case bus. In the example configuration,
this means that the line between the star coupler and OLM 4 is interrupted (the
lightning strike shown in Figure 3-7). If node 3 on OLM 4 wants to exchange data
with node 1 on OLM 1, the route from OLM 4 via OLM 5, 6 and 7 to the star
coupler must be calculated.
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