Festo FB16 Electronic Manual page 60

VIFB16 - 03/05
3-18
3. Installation
The following diagram shows the pin assign-
ment of the operating voltage connection.
24 V supply
for electronic
components
and inputs
PE
(protective earth
connection, leading contact)
Fig. 3/9: Pin assignment of the operating
voltage connection
Protective earthing
The valve terminal has two protective earth
connections:
•
at the operating voltage connection
(pin 4 incoming socket).
•
at the left-hand end plate (M4 thread).
PLEASE NOTE
•
Always connect the earth cable to pin 4 of
the operating voltage connection.
•
Connect an earth cable of sufficient cross-
section to the left-hand end plate if the
valve terminal is not mounted on an earthed
machine stand.
•
Make sure that the housing of the valve
terminal and the earth cable at pin 4 have
the same potential and that no equalizing
currents flow.
In this way you can avoid interference due to
electromagnetic sources.
24 V supply for
valves, outputs
1
4
2
3
0 V
0506b