Marginal Conditions For Wiring Interior Bus Cables - Siemens SIMATIC S7-300 Hardware And Installation Manual

The table below lists the properties of these bus cables.
Table 4-16
Impedance level
Loop resistance
Effective capacitance
Attenuation
Permissible conductor cross-sections
Permissible cable diameter
Wiring bus cables
When wiring PROFIBUS cables, you must not
• twist,
• stretch
• or compress them.
When wiring indoor bus cables, also maintain the following marginal conditions
(d = outer cable diameter):
A
Table 4-17
Bending radius (one-off)
Bending radius (multiple times)
Permissible temperature range during installation
Shelf and stationary operating temperature range –30 °C to +65 °C
Cross-reference
If you want to use optical waveguide cables for PROFIBUS, you can find further
information on this topic in the Manual SIMATIC NET, PROFIBUS Networks.
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
Properties of PROFIBUS cables
Properties

Marginal conditions for wiring interior bus cables

Characteristics
Values
approx. 135 Ω to 160 Ω (f = 3 MHz to 20 MHz)
≤ 115 Ω/km
30 nF/km
0.9 dB/100 m (f = 200 kHz)
2 2
0.3 mm to 0.5 mm
8 mm ± 0.5 mm
Condition
≥ 80 mm (10 x d
≥ 160 mm (20 x d
–5 °C to +50 °C
Configuring
)
A
)
A
4-35