
IMJ00503 V3E.DOC Page 16 of 40 19.02.2009
4.5.7 Segment Length
The maximum segment length between Profibus participants depends on the selected baud
rate. The following segment length requirements must be met:
Baud rate [baud] Segment length [m]
9.6 k – 93.75 k 1200
187.5 k 1000
500 k 400
1.5 M 200
3 M – 12 M 100
For cabling in accordance with these segmenting limits, you are stongly recommended to use
cable of type A.
This cable type provides the following performance features:
Surge impedance 135 ... 165 W
Capacitance per unit length
£
30 pf/m
Loop impedance
£
110 W/km
Wire diameter > 0.64 mm
Wire cross section > 0.34 mm²
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