PROFIBUS line (DP line)
A
DP line is a bus cable between two terminating resistors and can contain up to 64 PROFIBUS
slaves. In addition, a DP line is limited by the permissible cable length, which varies according
to the transmission rate.
Terminating resistor
A cable must be terminated with its own surge impedance to prevent line disturbances caused
by reflections. Activate the terminating resistor at the first and last node of a subnet or segment
(ON).
Make sure that the nodes to which the terminating resistor is connected are always supplied
with voltage during power-up and operation.
6.9.2 PROFIBUS cables and connectors
Features of PROFIBUS cables
The PROFIBUS cable is a two-core, twisted and shielded cable with the following features:
Table 6-7 Features of PROFIBUS cables
Features Values
Wave impedance Approximately 135 to 160 Ω (f = 3 to 20 MHz)
Loop resistance ≤ 115 Ω/km
Working capacity 30 nF/km
Attenuation 0.9 dB/100 m (f = 200 kHz)
Permissible core cross-section 0.3 mm
2
to 0.5 mm
2
Permissible cable diameter 8 mm + 0.5 mm
Connector features
The bus connector is used to connect the PROFIBUS cable to the PROFIBUS DP interface
(X21), thus establishing a connection to additional nodes.
You will find an overview of the bus connectors available for order in the chapter titled "Spare
parts and accessories".
Connecting
6.9 Connecting the PROFIBUS DP interface (410 DP only)
SIMOTION D410
78 Manual, 04/2014
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