User Manual

3. Installation
3−20
Festo GDCP−SFC−LACI−DN−EN en 0812NH
3.7.3 Bus power supply
Bus supply Avoid excessively long distances between the bus
interface/logic supply and the SFC−LACI.
Caution
· When connecting the field bus interface and the power
supply for the bus interface pay attention to the polarity.
· Connect the screen.
· Protect the power supply for the bus interface with an
external fuse, in accordance with the number of bus
slaves.
Note
Bus slaves have different tolerances in respect of the
interface supply, depending on the manufacturer. Observe
this when planning the bus length and pl
acing the power
supply unit.
For the SFC−LACI the following tolerance applies to the bus
interface supply (pin 9 on the Sub−D plug):
V
max
= 30.0 V
V
min
= 11.0 V
Recommendation:
Place the power supply unit approximately at the centre of
the bus.