Cable specifications
3
Recommended cable types
The PROFIBUS standard defines two variations of the bus cable: Cable type A and cable type
B. It is recommended to use cable Type A in all new installations.
Both types have cable shielding that guarantees adequate protection from electromagnetic
interference and thus the most reliable data transfer.
Table 3-1 Cable type A specifications
Type A
Cable structure twisted pair, individual shield
Wire size 0.8 mm
2
(AWG 18)
Loop resistance (DC) 44 Ω/km
Impedance at 31.25 kHz 100 Ω ± 20%
Attenuation at 39 kHz 3 dB/km
Capacitive asymmetry 2 nF/km
Envelope delay distortion (7.9 to 39 kHz) 1.7 μs/km
Shield coverage 90%
Max. cable length (inc. spurs >1 m) 1900 m (6233 ft)
Siemens provides a suitable cable for non-hazardous area with following order number -
6XV1830-0EH10
Overall cable length
The overall cable length is made up of the length of the main cable and the length of all spurs
(>1 m/3.28 ft).
The maximum network expansion depends on the type of ignition protection and the cable
specifications.
Note
If repeaters are used the maximum allowed cable length is doubled. Max. three repeaters are
permitted between user and master.
PROFIBUS transmission rate (kBit/s) Cable length
[m] [ft]
9.6 1200 400
19.2 1200 400
45,45 1200 400
93,75 1200 400
FCT030 Profibus (From firmware 4.0)
Function Manual, 06/2018, A5E39931906-AB 67
To Next Page
Loading...
