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Configuring Networks
3-17
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Configuration Rule
A maximum of 11 OLMs can be cascaded in a redundant ring; in other words, a
frame can pass through a maximum of 11 OLMs when being transferred from a
sending to a receiving DTE.
OLM OLM
OLM
OLM OLM
200 m 400 m 500 m 600 m
1000 m
54
Redundant line
Highest bus
load in network
Redundant
mode = ON
1. ITP standard cable 9/15
1
1
Node 1
Node 2
Shortest section
2. Fiber-optic cable (FO)
2
Figure 3-5 Example of a Redundant Ring Structure with OLMs
The total cable length includes all the cable lengths in the ring and the cables to
the DTEs less the shortest section in the ring (in other words, the worst-case
situation if a section breaks down).
Example:
5 OLMs are connected in a redundant ring. 5 OLMs mean that 3020 m remain for
the cable length. Each DTE with an integrated TP port is connected via a 100 m
TP cable. This means that 2540 m remain for the redundant ring. The sum of the
lengths in this example is 200 m + 400 m + 500 m + 600 m + 1000 m = 2700 m,
minus the shortest section of 200 m leaves 2500 m. This means that the redundant
ring structure has been created according to the configuration rules.
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