22
Installation and Operation Manual
X-DPT-Profibus-DP-Interface-eng
PN 541-C-068-AAG
November, 2008
In order to prevent these effects special precautions must be taken. A special
connection plug combination is required, including two serially placed inductors
each one in each network line. It is recommended that the inductors be placed
in the connector rather than in the Profibus device. It is also recommended to
place inductors in each line segment starting or ending at any station connector.
Therefore stub lines should also not be used, when operating the network at
high baud rates.
The value of each inductor is determined to be 120 nH, assuming the total
capacity for a bus station of approximately 30pF (taking in to account the
capacity of the connector, the line length to the RS-485 driver etc.). Refer to
Figure 3-4 below for installation. The before mentioned special Profibus connec-
tors often include the inductors for each cable segment connected to that
connector. Ensure that the selected connector is suited for operation at higher
baud rates then 1.5 Mbaud.
Figure 3-8: High-speed communication inductors.
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