Technical data

Cables for PROFIBUS RS485 networks
5.9 PROFIBUS FC trailing cable
PROFIBUS Network Manual
128 System Manual, Edition 04/2009, C79000-G8976-C124-03
The structure of the cable allows the use of the FastConnect (FC) stripping tool for fast
stripping of the outer jacket, see Section
Installation instructions for SIMATIC NET
PROFIBUS FAST CONNECT (Page
138).
6ES7 972-0BA30-0XA0 bus connectors cannot be connected.
Properties
The characteristics of the trailing cable differ from those of the standard bus cable as follows:
● Extremely good resistance to abrasion
● Resistance to mineral oils and fats
● Extremely good resistance to UV radiation
● Small bending radii for installation and operation
● Due to the smaller Cu crosssection, the d.c. loop resistance and the HF attenuation are
higher which means a reduced segment length.
● The jacket material is flame resistant
Use
The trailing cable is designed for a minimum of 4 million bending cycles at the specified
bending radius and a maximum acceleration of 4 m/s
2
and is therefore particularly suitable
for installation in drag chains.
Note
During installation and operation, all mechanical requirements for the cable such as bending
radii, tensile strain etc. must be kept to.
Segment lengths
Due to the increased loop resistance, somewhat shorter segment lengths are permitted at
low transmission speeds, see Section
Network configuration (Page 41). At 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.