HI 800 101 HIMatrix Engineering Manual
Shielding
Ground
Ground
Station 1 Station 2
RxD/TxD-P (3)
DGND (5)
VP (6)
RxD/TxD-N (8)
(3) RxD/TxD-P
(5) DGND
(6) VP
(8) RxD/TxD-N
RxD/TxD-P (3)
DGND (5)
VP (6)
RxD/TxD-N (8)
Data line
Data line
390 Ohm
220 Ohm
390 Ohm
Figure 19: Pin assignment of the field bus interface
Line length depending on the baud rate with PROFIBUS-DP bus cable
Baud rate Range per segment
9.6 kBit/s 1200 m
19.2 kBit/s 1200 m
93.75 kBit/s 1200 m
187.5 kBit/s 1000 m
500 kBit/s 400 m
1500 kBit/s 200 m
3000/6000/12000 kBit/s 100 m
Table 13: Range depending on the baud rate
The data corresponding to the range refer to the cable type A with the following parameters:
Impedance : 135 to 165 Ω
Capacitance per unit length : < 30 pF/m
Loop resistance : 110 Ω/km
Core diameter : 0.64 mm
Core cross section : < 0.34 mm
2
Note
A prolongation of the line length can be achieved via bidirectional
repeater. Up to three repeaters can be set between two devices.
In this way a line length of 4.8 km in total is possible.
At time-critical applications no more than 32 devices should be
connected. In non-time-critical applications up to 126 devices
(with repeater) are possible.
Further informations you will find in Manual HIMA PROFIBUS-DP master (HI 800 008).
5.4.2.3 MODBUS Master/Slave Communication
The total length of a bus at MODBUS can be up to 1200 m. Repeaters are needed for
greater distances. In total three repeaters are applicable for a maximum range of 4800 m.
Further informations you will find in Manual HIMA MODBUS master/slave (HI 800 002).
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