Fieldbus Baud Rate And Fieldbus Length - Festo CTEU-PB Electronics Description

1. Installation
Fieldbus segment length

1.5.3 Fieldbus baud rate and fieldbus length

Cable length (approximate values) dependent on the data rate (baud rate)
1)
Baud rate
9.6 kBaud
19.2 kBaud
93.75 kBaud
187.5 kBaud
500 kBaud
1-14
Surge impedance:
Capacity per unit length: < 30 nF/km
Loop resistance:
Wire diameter:
Wire cross section:
Precise specifications on the fieldbus segment length can be
found in chap. 1.5.3 and in the product documentation of
your control system.
Note
The maximum permissible fieldbus segment lengths (cable
length without repeater) are dependent on the baud rate
used.
Observe the maximum permissible segment length if
•
you connect the bus node to a fieldbus segment.
Avoid branch lines.
•
The baud rate is specified by the master. It limits the usable
cable lengths (see Tab. 1/2).
2)
Segment length
Max. 1200 m
Max. 1200 m
Max. 1200 m
Max. 1000 m
Max. 400 m
135 ... 165 ohms (3 ... 20 MHz)
< 110 ohms/km
> 0.64 mm
2
› 0.34 mm
Branch line length
Max. 500 m
Max. 500 m
Max. 100 m
Max. 33.3 m
Max. 20 m
Festo P.BE-CTEU-PB-OP+MAINT-EN en 1208NH English
3)
(total)