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4. Troubleshooting (PROFIBUS DP)
4.2.3.5 Network Configuration and Specifications
(1) Maximum Cable Length
Check that the cables used on the network meet the following specifications.
Baud Rates Max. Cable Length
12 Mbps
6 Mbps
3 Mbps
1500 kbps
500 kbps
187.5 kbps
93.75 kbps
19.2 kbps
9.6 kbps
100 m
100 m
100 m
200 m
400 m
1000 m
1200 m
1200 m
1200 m
(2) Terminating Resistor
Ensure that two terminating resistors are connected to both ends of the network.
The terminating resistor should be connected as shown below.
VP (6)
390
Ω
RxD/TxD-P (3)
220
Ω
RxD/TxD-N (8)
390
Ω
DGND (5)
Data Line B
Data Line A
(3) Cable
The cables should meet the PROFIBUS specifications.
Item Property
Impedance
135 to 165
Ω
Capacity < 30 pf/m
Loop resistance
110
Ω/km
Wire diameter 0.64 mm
Core cross-section > 0.34mm
2
Fieldbus I/O Rev.6 135