Siemens Automation System S7-400 - Manual (Page 116)

Networking
5-18
Automation System S7-400 Hardware and Installation
A5E00850741-01
5.5 PROFIBUS-DP Bus Cables
PROFIBUS-DP Bus Cables
Siemens supply the following PROFIBUS-DP bus cables (see catalog ST 70):
PROFIBUS-DP bus cable 6XV1830-0AH10
PROFIBUS-DP cable for burying in ground 6XV1830-3AH10
PROFIBUS-DP trailing cable 6XV1830-3BH10
PROFIBUS-DP bus cable with PE sheath (for foodstuffs and
luxury food industry)
6XV1830-0BH10
PROFIBUS-DP bus cable festoons 6XV1830-3CH10
Characteristics of the PROFIBUS-DP Bus Cable
The PROFIBUS-DP bus cable is a twisted, shielded pair with the following
characteristics:
Characteristics Values
Impedance approx. 135 to 160 Ω (f = 3 to 20 MHz)
Loop resistance ≦ 115 Ω/km
Working capacitance 30 nF/km
Attenuation 0.9 dB/100 m (f = 200 kHz)
Permissible core cross-section 0.3 mm 2 to 0.5 mm 2
Permissible cable diameter 8 mm ± 0.5 mm
Rules for Laying Cables
When you lay the PROFIBUS-DP bus cable, you should not:
• Twist it,
• Stretch it, or
• Compress it.
Furthermore, when installing the indoor bus cable, you must observe the following
basic conditions (d
A
= outer diameter of the cable):
Characteristics Boundary
Conditions
Bending radius for single bend ≥ 80 mm (10 x d
A
)
Bending radius for repeated bends ≥ 160 mm (20 x d
A
)
Permissible temperature range for installation -- 5 _C to + 50 _C
Storage and stationary operating temperature range -- 30 _C to + 65 _C