Siemens SIMATIC NET PROFIBUS - Manual (Page 77)

Configuring Networks
3-11
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
3.2 Configuring Optical Networks
Configuration Parameters for Optical Networks
When configuring optical PROFIBUS networks, the following parameters must be
taken into account:
S Using fiber-optic cables, only point-to-point links can be established.
S
The maximum signal attenuation of the transmission path (the power budget)
must be within the permitted values.
S The minimum or maximum permitted transmission rates of the components
(only one uniform transmission rate can be used in a network).
S
The cascading rules for the components used.
S
The maximum permitted number of nodes in the network.
S
In large-span networks, the transmission delay time.