Connecting The Profibus Dp Interface (410 Dp Only); Connection Components In Profibus; Profibus Cables And Connectors; Table 5-6 Features Of Profibus Cables - Siemens SIMOTION D410 Manual

5.9

Connecting the PROFIBUS DP interface (410 DP only)

5.9.1

Connection components in PROFIBUS

Connection components
Individual nodes are connected via bus connectors and PROFIBUS cables. Remember to
provide a bus connector with a programming port at the ends of the subnet. This provides
you with the option to expand the subnet if needed, e.g., with a PG or SIMATIC HMI device.
Use RS 485 repeaters for the connection between segments and to extend the cable.
Segments
A segment is a bus cable between two terminating resistors. A segment can contain up to 64
nodes. In addition, a segment 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.
Make sure that the nodes to which the terminating resistor is connected are always supplied
with voltage during power-up and operation.
5.9.2

PROFIBUS cables and connectors

Features of PROFIBUS cables
The PROFIBUS cable is a two-core, twisted and shielded cable with the following features:
Table 5-6
Features
Wave impedance
Loop resistance
Working capacity
Attenuation
Permissible core cross-section
Permissible cable diameter
D410
Manual, 03/2007 Edition
5.9 Connecting the PROFIBUS DP interface (410 DP only)
Features of PROFIBUS cables
Values
Approx. 135 to 160 Ω (f = 3 to 20 MHz)
≤ 115 Ω/km
30 nF/km
0.9 dB/100 m (f = 200 kHz)
0.3 mm to 0.5 mm
2 2
8 mm + 0.5 mm
Connecting
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