Description Of The Functions - Siemens SIMATIC NET PROFIBUS Owner's Manual

Infrared Link Modul (ILM)
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Description of the Functions

5.1 Transmission Rate
The SIMATIC NET PROFIBUS ILM supports the following transmission rates:
9.6 Kbps
19.2 Kbps
45.45 Kbps
93.75 Kbps
187.5 Kbps
500 Kbps
1.5 Mbps (default)
The transmission rates of the connected network nodes can have the tolerance of )/–0.3% as specified in the
PROFIBUS standard.
5.2 Topologies
The PROFIBUS ILM can be used in two topologies:
â
The 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.
â
The 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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