Festo IFB05-03, Manual

Page: 57 / 154

3. Installation
3−23
Festo P.BE−VIFB5−03−EN en 0503e
3.4 Connecting the field bus interface
There are two field bus plugs on the node for connecting the
valve terminal to the field bus. One of these connections is
intended for the incoming cable; the other is for the continu
ing bus cable. The signal cables of both plugs are connected
with each other internally.
This permits two types of connections.
looping the field bus cable from valve terminal to valve
terminal. Both field bus plugs are required here.
connecting the field bus cable with a T−adapter. Only one
field bus plug is required here.
Caution
Branches (e.g. T−adapters) cause signal reflections with
high baud rates. This can lead to telegram faults" with
brief failure" of the valves.
Recommendation:
S
Do not exceed the maximum permitted distance of 15 cm
between the T−adapter and the field bus plug, in order to
avoid signal reflections.
S
Use the Festo T−adapter FB−TA for this purpose.