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Festo CPA…-ASI-8E8A-Z 1108a English
19
Diagnosis / LED display
ASI LED
Fault LED
Meaning
on
off
AS-Interface voltage applied, no fault
off
off
No AS-Interface voltage
flashes
on
AS-Interface address not set (= 0)
flashes
flashes
Additional power supply not applied or
undervoltage (possibly valves do not switch),
periphery fault
on
flashes
Short circuit/overload at input
on
on
Bus communication failed (watchdog expired)
AUX/PWR LED
Meaning
on
Additional power supply applied, no fault
off
Additional power supply is missing or is less
than approx. 6 V
Status LEDs
Meaning
on
1 signal at input/output
off
0 signal at input/output
Note
The AS-Interface has an integrated watchdog function
which resets the outputs if there is a bus communica-
tion failure.