IFM Electronic AC016S Originalbetriebsanleitung Seite 21

If somewhere in this chain one or several faults occur, the enable signal
is interrupted starting from the first detected fault source. The LED 1
yellow provides the information whether all connected fail-safe
switches have given the enable signal.
Internal faults
If the evaluation unit detects a fault, the unit changes to the safe state
(LED 4 red, see operating elements and indicators).
A function test of the evaluation unit allows checking for the presence
of a hardware error, or whether the change to the safe state has been
caused by external faults.
To do so the evaluation has to be switched off briefly for min. 50 ms
(data bit D0, 1= evaluation OFF).
Voltage supply
If after power on the LED green PWR is not lit, the supply voltage must
be checked.
Overload and short circuit of the input supply are signalled to
the AS-i master (version 2.1) via the "periphery fault" flag in
the status register.
Maintenance/duration of use
The evaluation unit is maintenance-free. The maximum duration of use
is 10 years.
Limited voltage
The device shall be supplied from an isolating transformer having a
secondary Listed fuse rated as noted in the following table.
Control-circuit wire size Maximum protective device rating
AWG
26
24
22
20
18
16
Overcurrent protection
2
mm
(0.13)
(0.20)
(0.32)
(0.52)
(0.82)
(0.13)
ampere
1
2
3
5
7
10
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