Festo CPV -VI Series Manual page 82

4. Commissioning
The LEDs show the switching status of the valve sole-
noid coils. The meaning of the LEDs is shown in the
table below.
LED Switching position of valve
Yellow out Basic position
Yellow alight – Switch position
– basic position
4-14
Meaning
Logic 0 (signal not applied)
Logic 1 (signal applied)
or
Logic 1 but:
– operating voltage of outputs is
below permitted tolerance range
(DC 20.4 V to 26.4 V)
– compressed air supply not correct
– pilot exhaust blocked
– return for servicing
or
or
or
CPV... 9811d