Festo CPV-DI01 Manual page 35

1. Installation
Festo P.BE-CP-DI01-EN en 0007a
Recommendation:
Use a cable with a capacitance per unit length of < 30 nF/km
as specified below.
Otherwise the permitted cable length will be reduced.
Baud rate Field bus length
(in kBaud) (max.)
9.6 1200 m
19.2 1200 m
93.75 1200 m
187.5 1.000 m
500 400 m
1500 200 m
3000...12000 100 m
Fig. 1/14: Maximum permitted field bus and branch line lengths
for PROFIBUS-DP depending on the baud rate
Cable specification as per EN 50170 (cable type A):
Characteristic impedance:
Capacitance per unit length:
Loop impedance:
Core diameter:
Core cross sectional area
Maximum
permitted branch
line length
500 m
500 m
100 m
33.3 m
20 m
6.6 m
—
135...165 Ohm (3...20 MHz)
< 30 nF/km
< 110 Ohm/km
> 0.64 mm
2
> 0.34 mm
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