Festo IFB05-03 Manual page 102

5. Diagnosis and error treatment
LED Switching position of the valve
solenoid coil
yellow out basic position
yellow alight switch position
or
basic position
Fig. 5/6: LEDs for the status display of the valve solenoid coils
5−8
Short circuit/overload (only type 04−B)
The valve solenoid coils of valve terminal type 04−B are fitted
with special fuses for protection against short circuit or over
load. The method of replacing these fuses is described in
chapter 5.6.
Meaning
logical 0 (no signal)
logical 1 (signal present)
logical 1 but
operating voltage of outputs lies
below permitted tolerance range
(21.6 V...26.4 V DC)
or
compressed air supply not correct.
or
pilot exhaust blocked.
or
servicing required
Festo P.BE−VIFB5−03−EN en 0503e