Siemens SIMATIC NET PROFIBUS Instructions d'exploitation télécharger pdf (Page 13)

SIMATIC NET PROFIBUS Optical Link Module OLM V4.0

Operating Instructions, 01/2013, C79000-G8976-C270-03

3 Network Topologies

Which network topologies can be implemented?

The following network topologies can be implemented with the PROFIBUS OLM:

• Point-to-point connection

• Bus (linear) topology

• Star topology

• Redundant optical ring

Combinations of these basic types are also possible. To set up the fiber-optic links of these

network topologies, cables with two optical fibers are used.

If a high degree of availability is required of the fieldbus network, this can be increased by

using a redundant network configuration, for example to allow continued communication if a

cable is broken.

Please note the following:

 Single DTEs or complete PROFIBUS segments with a maximum of 31 nodes can be

connected to the electrical interface of the PROFIBUS OLM.

 Use only fiber-optic cables in areas subject to heavy noise to avoid EMC problems

affecting the entire network.

 Only OLMs of the same wavelength may be connected to each other optically:

– OLM / P11, OLM / P12 and OLM / P22 with each other

– OLM / G11, OLM / G12, OLM / G22, and OLM / G12 EEC with each other

– OLM / G11-1300 and OLM / G12-1300 with each other

 Optical channels connected via fiber-optic cables must be set to the same mode.

 Transitions between different OLM types are only possible via the RS-485 interface.

 In the network topologies described below, the OLM / G12-EEC can be used everywhere

where an OLM / G12 can be used.

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Siemens SIMATIC NET PROFIBUS Instructions d'exploitation Page 13