Connecting The Profibus Dp Interface (410 Dp Only); Profibus Connection Components; Profibus Cables And Connectors - Siemens SIMOTION D410 PN Manual

Connecting

5.9 Connecting the PROFIBUS DP interface (410 DP only)

5.9 Connecting the PROFIBUS DP interface (410 DP only)
5.9.1

PROFIBUS connection components

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.
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.
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- 7
Features
Wave impedance
Loop resistance
Working capacity
Attenuation
Permissible core cross-section
Permissible cable diameter
70
Features of PROFIBUS cables
Values
Approximately 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
SIMOTION D410
Manual, 02/2012