Sequence 3 (LatchedAck-F-S)
This sequence has a latched function and works in collecting mode. Every LED is
independent of the other LEDs in its operation. At the activation of the input signal, the
indication starts flashing. After acknowledgment the indication disappears if the signal
is not present any more. If the signal is still present after acknowledgment it gets a
steady light.
Activating
signal
LED
Acknow.
en01000231.vsd
IEC01000231 V1 EN
Figure 16:
Operating sequence 3 (LatchedAck-F-S)
When an acknowledgment is performed, all indications that appear before the
indication with higher priority has been reset, will be acknowledged, independent of if
the low priority indication appeared before or after acknowledgment. In
shown the sequence when a signal of lower priority becomes activated after
acknowledgment has been performed on a higher priority signal. The low priority
signal will be shown as acknowledged when the high priority signal resets.
Activating
signal RED
LED
Acknow
IEC09000313_1_en.vsd
Activating
signal GREEN
R
R
G
IEC09000313 V1 EN
Figure 17:
Operating sequence 3, 2 colors involved
If all three signals are activated the order of priority is still maintained.
Acknowledgment of indications with higher priority will acknowledge also low
priority indications, which are not visible according to
.
Section 5
1MRK 505 277-UUS C
Local Human-Machine-Interface LHMI
60
Technical Manual
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