Connecting The Fieldbus; System Structure On The Remote Bus - Festo CPX-M-FB20 Manual

1. Installation
1.4

Connecting the fieldbus

1.4.1 System structure on the remote bus

1-12
There are one (FB20) or two (FB21) connections on the node
for connecting the Interbus. One connection is for the incom-
ing line; the other is intended for the continuing bus cable.
Observe the differences in the remote bus, which are listed
below.
Note
Faulty installation and high transmission rates may cause
data transmission errors as a result of signal attenuations.
Transmission errors can be caused by:
– transmission over distances which are too long
– inappropriate cables.
Observe the cable specifications! Obtain information about
the cable type to be used from the manual for the interface
module or from the Interbus installation manual.
The CPX terminal with bus node FB20/21 is a fibre-optic
remote bus participant on the Interbus with Rugged Line
connection technology. Dependent on the modules used, it
reacts to the remote bus like a fibre-optic bus terminal with
integrated I/Os and it must be addressed accordingly.
Note
– Commissioning on the remote bus can only take place if
all slaves are completely connected, or if they are
bridged by means of a software setting.
– The CPX terminal requires a 24 V DC power supply.
This is supplied via the Rugged Line plug. It is possible
to supply and switch off separately the valve terminal
outputs/valves.
Festo P.BE-CPX-FB20/21-EN en 1202a