Festo 03-B, Electronic Manual

Page: 43 / 120

3. Installation
3-9
Festo P.BE-VIDN-03-8A-GB 0003NH
3.3 Connecting the valve terminal
3.3.1 Connecting cable
Use a twisted screened 4-core cable for the field bus. The bus
interface and the internal logic of the valve terminal are sup-
plied with power via the field bus cable.
Please note
S
You must refer to the PLC manual or to the manual for
your scanner in order to ascertain the correct type of
cable to use.
S
Take into account here the distance and the baud rate
selected. Select the appropriate cable diameter.
Notice the voltage drop:
– in the supply cable for the bus interface and
– in the internal logic of the valve terminal.
Bus length The table below shows the guide values for the distance de-
pending on the baud rate selected. Detailed information can
be found in the manuals for your control system and
scanner.
Baud rate Maximum
main bus
length Branch line
length
(maximum) Branch line
length
(cumulative)
125 kBaud 500 m 6 m 156 m
250 kBaud 250 m 78 m
500 kBaud 100 m 39 m