Profibus Physical Media - ABB PFEA 111 User Manual

Tension Electronics PFEA111/112, User Manual
Chapter 3 Commissioning

3.13.3 Profibus Physical Media

3-26
The bus line is specified in EN 50170 as line type A. Line type B should be avoided.
The physical properties of the media are shown in
Parameter
Impedance in 
Capacitance per unit length (pF/m)
Loop resistance ( /km)
Core diameter (mm)
Core cross section (mm
The specified line parameters result in the following lengths of a bus segment.
Table 3-6. Maximum Cable Lengths per Segment
Maximum bus
segment length (m)
Wire A
Wire B
Stub lines up to 1500 kbit/s < 6.6 m.
If you are using 12 Mbits/s you should avoid stub lines.
If you are using line A as specified by EN 50 170, the bus terminating resistance combination
is as shown in Figure 3-18, so that a defined idle state potential is ensured on the line.
Signals on the Connector
Pin No. in Brackets
VP(6)
Data line - B(3)
Data line - A(8)
GND (5)
Figure 3-18. Line Termination of Wire A in Accordance with EN 50170
Table 3-5
Table 3-5. Line Parameters
Line type A
135 to 165
<30
110
0.64
2
) > 0.34
Transmission rate in kbit/s
9.6 19.2 93.75
1200 1200 1200
1200 1200 1200
and Table 3-6.
Line type B
(Avoid if possible)
100 to 130
<60
---
> 0.53
> 0.22
187.5 500 1500
1000 400 200
600 200 -
Terminating Resistance of the Bus
390 
220 
390 
3BSE029380R0101 Rev C
12000
100
-