Siemens SIMATIC NET PROFIBUS User Manual
Page 113
Passive Components for RS-485 Networks
4-15
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Properties
The characteristics of the trailing cable differ from those of the standard LAN cable
as follows:
S
Extremely good resistance to abrasion
S
Resistant to mineral oils and grease
S
Extremely good resistance to UV radiation
S
Small bending radii for installation and operation
S
Due to the smaller Cu cross-section, the d.c. loop resistance and the HF
attenuation are higher which means reduced segment lengths.
S
The sheath material is flame resistant
Uses
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 the mechanical restrictions involving the cable
such as bending radii, tensile load etc. must be adhered to.