Siemens SIMATIC NET PROFIBUS manual Transmission Rate, Topologies

Infrared Link Modul (ILM) 6ZB530–3AC30–0BA1

5 Description of the Functions

5.1Transmission Rate

The SIMATIC NET PROFIBUS ILM supports the following transmission rates:

9.6 Kbps

19.2Kbps

45.45Kbps

93.75Kbps

187.5Kbps

500 Kbps

1.5Mbps (default)

The transmission rates of the connected network nodes can have the tolerance of )/–0.3% as specified in the PROFIBUS standard.

5.2Topologies

The PROFIBUS ILM can be used in two topologies:

âThe point-to-point link between two PROFIBUS ILMs where one or more master or slave nodes can be attached to one subnet and one or more slave nodes can be attached to the other.

âThe point-to-multipoint link between a PROFIBUS ILM to which a subnet with one or more masters or slaves is connected and n PROFIBUS ILMs with n subnets or DTEs without master functionality. In a point-to-multipoint link, the optical contact between the master network and the subnets is necessary. For a PROFIBUS ILM with purely slave subnets, an unobstructed view between them is not necessary.

Possible topologies are illustrated below based on sample configurations.

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