3.1 Line topology
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3 Network Topologies
Version 1.0 8/00
3 Network Topologies
The following network topologies can be realized with the PROFIBUS OLM:
 Point-to-point connections
 Line topologies
 Star topologies
 Redundant optical rings
Combinations of these basic types are also possible. Lines with two optical fibers are used to create the fiber links for
these network topologies.
If a malfunction – e.g. a break in a fiber line – makes a high degree of field bus network fail-safety necessary, the
availability of the network can be increased using a redundant network configuration.
Please note:
 Single terminals or entire PROFIBUS segments with max. 31 subscribers can be connected to the electrical
interface of the PROFIBUS OLM.
 In areas with a high EMC incidence, only lay optical fiber lines in order to exclude the possibility of EMC
affecting the whole network.
 Optically only OLMs of the same type can be connected together:
– OLM/P11 with OLM/P12
– OLM/G11 with OLM/G12 and OLM/G12 EEC
– OLM/G11-1300 with OLM/G12-1300
 Optical ports which are connected by optical fiber must be set to the same operating mode.
 Junctions between different OLM types are only possible via the RS485 interface.
 OLM/G12-EEC can be used everywhere in those network topologies described below in which a OLM/G12 can
also be used.
3.1 Line topology
Fig. 2: Network structure in an optical line topology
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