Network Components For A Profibus Subnet - Siemens SIMOTION C Operating Instructions Manual

Greater cable lengths
You need to install RS485 repeaters for segments requiring cable lengths longer than the
allowed length. The maximum possible cable length between two RS 485 repeaters
corresponds to the cable length of a segment (see the previous table). You can connect up
to nine RS 485 repeaters in series.
Note that an RS 485 repeater must be counted as a subnet node when determining the total
number of nodes to be connected. This is true even if the RS 485 repeater is not assigned its
own PROFIBUS address.
5.2.3

Network components for a PROFIBUS subnet

PROFIBUS cable
We can offer you e.g. the following PROFIBUS cables:
Table 5- 9
PROFIBUS cable
PROFIBUS direct-buried cable
PROFIBUS drum cable
Properties of the PROFIBUS cable
The PROFIBUS cable is a two-core, twisted, and shielded cable with the following features:
Table 5- 10
Characteristic impedance
Loop resistance
Effective capacitance
Damping
Permissible conductor cross-section
Permitted cable diameter
SIMOTION C
Operating Instructions, 02/2012
PROFIBUS cable
Cables
Properties of the PROFIBUS cable
Features
Order no.
6XV1 830-0EH10
6XV1 830-3FH10
6XV1 830-3EH10
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
5.2 Networking
125