Epson RC620 Manual page 205

4.2.3.5 Network Configuration and Specifications
(1) Maximum Cable Length
(2) Terminating Resistor
(3) Cable
RC620 Option Fieldbus I/O Rev.8
Check that the cables used on the network meet the following specifications.
Baud Rates
12 Mbps
6 Mbps
3 Mbps
1500 kbps
500 kbps
187.5 kbps
93.75 kbps
19.2 kbps
9.6 kbps
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
Data Line B
RxD/TxD-P (3)
220 Ω
Data Line A
RxD/TxD-N (8)
390 Ω
DGND (5)
The cables should meet the PROFIBUS specifications.
Item
Impedance
Capacity
Loop resistance
Wire diameter
Core cross-section
4. Troubleshooting (PROFIBUS DP)
Max. Cable Length
100 m
100 m
100 m
200 m
400 m
1000 m
1200 m
1200 m
1200 m
Property
135 to 165 Ω
< 30 pf/m
110 Ω/km
0.64 mm
2
> 0.34mm
195