F 8628X (0650)
430
8 Characteristics of the PROFIBUS DP
transmission
On the PROFIBUS-DP’s physical layer, the data are transferred in accordance with the RS-
485 standard.
The following table presents the basic technical features of the RS 485 transmission used for
PROFIBUS-DP.
Table 10: Characteristics of the RS 485 transmission technology
8.1 Bus dependencies between cable length and baud rate
Table 11: Dependencies between cable length and baud rate
Cable lengths specified in Table 11 refer to cable type A with the following parameters:
• Surge impedance 135
Ω up to 165 Ω
• Capacitance per unit length < 30 pF/ m
• Loop resistance 110 W / km
• Core diameter 0.64 mm
• Core cross-section > 0.34 mm²
Area Sizes Remark
Network topology Linear bus, active bus ter-
mination on either end
Branch lines should be avoided.
Medium Shielded, twisted cable Shielding can be omitted depending on
the environmental conditions.
Number of stations 32 stations in each seg-
ment without repeater
With repeaters, expandable up to 126
stations
Connectors 9-pole SUB-D
connector
Available from HIMA
Baud rate Range / Segment
9.6 kBit/s 1200 m
19.2 kBit/s 1200 m
45.45 kBit/s 1200 m
93.75 kBit/s 1200 m
187.5 kBit/s 1000 m
500 kBit/s 400 m
1.5 MBit/s 200 m
3 Mbit/s 100 m
6 Mbit/s 100 m
12 MBit/s 100 m
To Next Page
Loading...
Need help?
General