Festo CP-FB13-E Programming And Diagnostics Manual page 23

1. Installation
Festo P.BE-CP-FB13-E-EN en 0112e
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 1000 m
500 400 m
1500 200 m
3000-12000 100 m
Fig. 1/4: Maximum permitted field bus and branch line
lengths depending on the baud rate
Cable specification as per EN 50170 (cable type A):
Characteristic impedance:
Capacitance per unit length:
Loop resistance:
Core diameter:
Core cross-sectional area:
Max. 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
> 0.34 mm
2
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