Festo CDVI-DN Series Electronic Manual page 78

3. Diagnosis
3.1.3 LEDs for status display of the valve solenoid coils
LED Colour
out
yellow lights up
Tab. 3/5: LEDs for the status display of the valve solenoid coils
3−8
There is a yellow LED for every valve solenoid coil
(see Fig. 3/1). This LED indicates the switching status of the
valve solenoid coil.
Valve solenoid coil
Basic position
Switch position
Switch position
Basic position
Meaning
There is no signal (logical 0")
There is a signal (logical 1") but:
the load voltage of the valves lies
below the permitted tolerance range
(< 21.6 V DC)
There is a signal (logical 1")
There is a signal (logical 1") but:
compressed air supply not OK
or
pilot exhaust blocked
or
servicing is required
Festo P.BE−CDVI−DN−EN en 0404NH