Manual

Accessories (overview)
Communication modules
PROFIBUS
9
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381
EDS94SPP101 EN 7.1
Specification of the transmission cable
Please follow the specifications of the PROFIBUS user organisation (PNO) for signal cables:
Area Values
Specific resistance 135 ... 165 Ω/km,(f=3...20MHz)
Capacitance per unit length ≤ 30 nF/km
Loop resistance < 110 Ω/km
Core diameter >0.64mm
Core cross-section >0.34mm
2
Cores Double twisted, insulated and shielded
Baud rate / length of bus cable
Baud rate [kbps] Length [m]
9.6 ... 93.75 1200
187.5 1000
500 400
1500 200
3000 ... 12000 100
 Tip!
For high baud rates we recommend to consider the application of optical
fibres.
Advantages of optical fibres:
ƒ Electromagnetic interferences on the transmission path remain ineffective.
ƒ Bus lengths of several kilometres are also possible with higher baud rates.
The bus length is
– independent of the baud rate.
– dependent on the optical fibre used.