Siemens RS-485 Wartungshandbuch Seite 130

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Cables for PROFIBUS RS485 networks
5.10 PROFIBUS festoon cable
PROFIBUS Network Manual
130 System Manual, Edition 04/2009, C79000-G8976-C124-03
:Example of installation
Stopper
Clip
Runner
Lead runner
Kink protection
Pulling cord
to provide strain relief for the cable
Figure 5-11 Installation of the PROFIBUS festoon cable (schematic)
Segment lengths
Due to the increased loop resistance, somewhat shorter segment lengths are permitted at
low transmission speeds, see Section "
Network configuration (Page 41)". For transmission
speeds ≤ 500 kbps, the trailing cable has the same values as the standard bus cable.
Note
If you connect to screw terminals, the stranded cores must be fitted with wireend ferrules
(0.25 mm
2
complying with DIN 46228). Use only wireend ferrules made of materials with
permanently stable contact properties, for example copper with a tinplated surface (not
aluminum).
6ES7 972-0BA30-0XA0 bus connectors cannot be connected.
Installation guidelines
The cable must be unwound at a tangent from the drum and installed in the cable carriage
free of torsion.
The cable must be mounted on a flat cable carriage on a round half-shell support (angle
between cable and half-shell 90 degrees) and the radius of the half-shell must be greater
than > 70 mm.
The strain relief mechanisms on the cable carriage must have rubber clamps to avoid
crimping the cable.
Other cables installed in the festoon must not cause bends tighter than the minimum bending
radius of the trailing cable.
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