Technical data

Topologies of SIMATIC NET PROFIBUS networks
2.2 Topologies of optical networks
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
33
Alternative cabling strategy
If the distance between two OLMs turns out to be too long, a structure as shown in the figure
below can be implemented.
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4 3
11
OP 25
PG
S7-400
ET 200M
1
1
PG/PC/OP
2 44
1
4 3
11
OP 25
PG
S7-400
ET 200M
PG/PC/OP
2 44
1
11
① Terminating resistor activated
1 Fiber-optic cables
2 PROFIBUS bus cable
3 PROFIBUS connecting cable 830-1T
4 PROFIBUS connecting cable 830-2
Figure 2-6 Alternative cabling of a network structure in an optical twofiber ring topology