Lenze 931W - Manual (Page 16)

Electrical installation 4
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16 K-HB 13.0001-EN 2.1
Baud rate / length of the bus cable
Baud rate [kbit/s] Length [m]
9.6 - 93.75 1200
187.5 1000
500 400
1500 200
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Note!
The baud rate, depending on data volume, cycle time, and number of stations,
should be only as high as required for the application.
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Tip!
For high baud rates we recommend to check the use of optical fibres.
Advantages of the optical fibre:
ƒ External electromagnetic interferences have no effects on the transmission
path.
ƒ Bus lengths of several kilometres are also possible with higher baud rates.
The bus length
– does not depend on the baud rate.
– depend on the optical fibre used.
Specification of the transmission cable
Please observe our recommendations for signal cables.
Bus cable specification
Cable resistance
135 - 165 Ω/km, (f = 3 - 20 MHz)
Capacitance per unit length ≤ 30 nF/km
Loop resistance < 110 Ω/km
Wire diameter > 0.64 mm
Wire cross-section > 0.34 mm 2
Wires double twisted, insulated and shielded