Configuring
4.11 Planning subnets
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4-37
PROFIBUS cables
For PROFIBUS DP or MPI networking we offer you the following bus cables for diverse fields
of application:
Table 4-21 Available bus cables
Bus cable
Order number
PROFIBUS cable
6XV1 830-0AH10
PROFIBUS cable, halogen-free
6XV1 830-0CH10
PROFIBUS underground cable
6XV1 830-3AH10
PROFIBUS trailing cable
6XV1 830-3BH10
PROFIBUS cable with PUR sheath for
environments subject to chemical and
mechanical stress
6XV1 830-0DH10
PROFIBUS cable with PE sheath for the food and
beverages industry
6XV1 830-0BH10
PROFIBUS cable for festooning
6XV1 830-3CH10
Properties of PROFIBUS cables
The PROFIBUS cable is a 2-wire, shielded twisted-pair cable with copper conductors. It is
used for hardwired transmission in accordance with US Standard EIA RS485.
The table below lists the characteristics of these bus cables.
Table 4-22 Properties of PROFIBUS cables
Properties
Values
Wave impedance
approx. 135 Ω to 160 Ω (f = 3 MHz to 20 MHz)
Loop resistance
≤ 115 Ω/km
Effective capacitance
30 nF/km
Attenuation
0.9 dB/100 m (f = 200 kHz)
Permitted conductor cross-sections
0.3 mm
2
to 0.5 mm
2
Permitted cable diameter
8 mm ± 0.5 mm