
DMS 2.2 EN 07/2011 TD17 L 21
Control technology | PROFIBUS communication manual
Technical data
Bus cable specification
5.2 Bus cable specification
Please follow the specifications of the PROFIBUS user organisation for bus cables.
Baud rate / bus cable length
Adapt the baud rate to the length of the bus cable.
Field Values
Cable resistance 135 ... 165 Ω/km, (f = 3 ... 20 MHz)
Capacitance per unit length ≤ 30 nF/km
Loop resistance < 110 Ω/km
Core diameter > 0.64 mm
Core cross-section > 0.34 mm
2
Cores Twisted in pairs, insulated and shielded
Baud rate [kbps] Max. bus length [m]
9.6 ... 93.75 1200
187.5 1000
500 200
1500 200
3000 ... 12000 100
Note!
The baud rate depending of the data volume, cycle time, and number of stations
should only be selected as high as required for the application.
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