Festo VMPA-ASI-EPL 4E4A-Z Series Brief Description page 19

Diagnosis / display status LED for AS-Interface
AS-i Fault
on off
on flashes
on on
flashes flashes
flashes on
off off
AUX/PWR
on
off
Display status LED for inputs
on
off
Note
The AS-Interface has an integrated watchdog function
which resets the outputs if the bus communication
fails.
Festo P.BE-K-MPA-ASI-4E4A-Z 1109b English
Meaning
AS-Interface voltage applied, no fault
Short circuit/overload at input
Bus communication failed (watchdog expired)
Additional power supply not applied or
undervoltage (possibly valves do not switch),
periphery fault
AS-Interface address not set (= 0)
AS-Interface voltage not applied
Meaning
Additional supply exists
No additional supply or additional supply failed
1-signal at input/output
0-signal at input/output
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