
Configuring Networks
3-11
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
3.2.2 Bus Structure
The bus structure allows the cascading of OLMs or ELMs in series via fiber-optic
cables or twisted pair. A distance of 0 to 3100 m is possible between two link
modules connected by optical fiber. With TP cables, a distance of up to 100 m is
possible. If a module develops a fault or there is a break on the cable, the network
breaks down into two subnets. Within these subnets, problem-free operation
remains possible. The advantage of this topology is that large distances can be
covered providing the configuration rules are adhered to.
3.2.3 OLM Bus Structure via Optical Fiber
Up to 11 OLMs can be cascaded in series with a remaining cable length of 1180 m
providing no further network components exist (refer to the sample calculation).
OLM
OLM OLM
OLM
1
1
1. ITP standard cable 9/15
Node 1
Node 2
2
2. Fiber-Optic Cable (FO)
Figure 3-2 Example of an OLM Bus Structure
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