Festo CP-FB13-E - Page 23

1. Installation
1-11
Festo P.BE-CP-FB13-E-EN en 0112e
Recommendation:
Use a cable with a capacitance per unit length of
< 30nF/kmasspecifiedbelow.
Otherwise the permitted cable length will be reduced.
Baud rate
(in kBaud)
Field bus length
(max.)
Max. permitted
branc h line
length
9.6 1200 m 500 m
19.2 1200 m 500 m
93.75 1200 m 100 m
187.5 1000 m 33.3 m
500 400 m 20 m
1500 200 m 6.6 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: 135...165 Ohm (3...20 MHz)
Capacitance per unit length:
<30 nF/km
Loop resistance:
>110 Ohm/km
Core diameter:
>0.64 mm
Core cross-sectional area:
>0.34 mm
2