Wieland samos PRO COMPACT - Page 117

PROFIBUS DP gateway
Wieland Electric GmbH | BA000970 | 11/2016 (Rev. F)
117
Bus cable
The bus topology for PROFIBUS DP is a linear structure consisting of a shielded and twisted 2-
lead cable with active bus termination at both ends. The potential bus lengths range from 100
m at 12 kbit/s to 1200 m at 94 kbit/s.
Illustration 37: Bus cable of the SP-PROFIBUS-DP module
Table 69: Reference for pin configuration
Position
Description
1
PROFIBUS user gray
2
Shielded bus cable
3 PROFIBUS termination yellow (with integrated terminal resistances)
Line parameters
The bus cable characteristics have been defined in EN 50170 as cable type A.
Table 70: Line parameters of the SP-PROFIBUS-DP module
Characteristic
Value
Wave resistance
135-165 Ω (at a frequency of 3-20 MHz)
Capacity per length unit < 30 pF/m
Loop resistance
≤ 110 Ω/km
Lead diameter
> 0.64 mm
Wire cross-section
> 0.34 mm
2
These cable parameters provide the following maximum physical dimensions for a bus section:
Table 71: Maximum line lengths of the SP-PROFIBUS-DP module
Baud rate (kbit/s)
Maximum cable length (m)
9.6
1200
19.2
1200
93.75
1200
187.5
1000
500
400
1500
200
12000
100
Data transmission rate
The data transmission rate is automatically set. The maximum baud rate is 12 Mbit/s.