PROFIBUS-DP field bus
PCD0
26/766 E2
(HB_PCD0 26 766_E2.DOC)
SAIA-Burgess Controls Ltd.
Page 169
13.3
PROFIBUS-DP bus cable parameters
The properties of the bus cable are specified in EN 50170 Part 8-2 as
cable type A.
Parameter
Value
Surge impedance (
W)
135 ... 165
(@ frequency from 3...20MHz)
Capacitance per unit length
(pF/m)
< 30
Loop resistance (
W
/km)
<=110
Core diameter (mm)
>0.64*
Core cross-section (mm
2
)
> 0.34*
* The core cross-sections must match the connections on the bus
connector.
13.4
PROFIBUS-DP bus segment length
Baud rate in Kbit/s
Max. bus segment length in m
9.6
1200
19.2
1200
93.75
1200
187.5
1000
500
400
1500
200
12000
100
Only one baud rate can be selected in a PROFIBUS-DP system.