Siemens RS-485 Wartungshandbuch Seite 274

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Installing bus cables
C.8 Laying bus cables
PROFIBUS Network Manual
274 System Manual, Edition 04/2009, C79000-G8976-C124-03
Tensile strength
The tensile force exerted on the cables during or after installation must not exceed the limits
of tensile strength of the cables. The permitted tensile loading on your bus cable can be
found in the technical data sheets of the bus cables (see
Cables for PROFIBUS RS485
networks (Page
113)).
Pull cables using cable grips and protect connectors
To pull cables, make sure that you use cable grips. Before fitting the cable grip, make sure
that the connectors of preassembled cables are protected from the pressure exerted by the
cable grip, for example using a piece of protective tube.
Fitting strain relief
Make sure that you provide strain relief approximately 1 m from the connection point on all
cables subject to tensile loading. Shield clamps are not adequate for strain relief.
Pressure
Too much pressure on the cables must also be avoided, for example crimping the cable
when securing it in position.
Torsion
Torsion can lead to the elements of a cable being displaced and degrading the electrical
characteristics of cables. Bus cables must therefore not be twisted.
Do not twist trailing cables and festoon cables
Make sure that you install the SIMATIC NET trailing cable and the SIMATIC NET festoon
cable without any twisting. The line printed on the outer jacket along the length of the cable
helps to make sure that the cable in not twisted. If such moving cables are twisted during
installation, the cables will probably be damaged soon after they are put into operation!
Flexible cable for torsional load
If the cable is liable to be subjected to torsional load (for example robot cables), use the
"SIMATIC NET torsion cable". This cable is described in Section
Cables for PROFIBUS RS-
485 networks (Page
113).
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