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.
6.2.3 Network components for a PROFIBUS subnet
PROFIBUS cable
We can offer you e.g. the following PROFIBUS cables:
Table 6-9 PROFIBUS cable
Cables Article No.
PROFIBUS cable 6XV1 830-0EH10
PROFIBUS direct-buried cable 6XV1 830-3FH10
PROFIBUS drum cable 6XV1 830-3EH10
Properties of the PROFIBUS cable
The PROFIBUS cable is a two-core, twisted, and shielded cable with the following features:
Table 6-10 Properties of the PROFIBUS cable
Features Values
Characteristic impedance Approx. 135 to 160 Ω (f = 3 to 20 MHz)
Loop resistance ≦ 115 Ω/km
Effective capacitance 30 nF/km
Attenuation 0.9 dB/100 m (f = 200 kHz)
Permissible conductor cross-section 0.3 mm
2
to 0.5 mm
2
Permitted cable diameter 8 mm ± 0.5 mm
Rules for cable installation
PROFIBUS cables must not be twisted, stretched, or compressed.
Connecting
6.2 Networking
SIMOTION C
122 Operating Instructions, 11/2016, A5E33441428B
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