ABB Relion Technical Manual page 82

Section 5
Local Human-Machine-Interface LHMI
76
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.
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
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 GREEN
Activating
signal RED
LED
Acknow
IEC09000313 V1 EN
Figure 17: Operating Sequence 3 (LatchedAck-F-S), 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
R G
R
Figure 18.
1MRK 502 048-UUS A
en01000231.vsd
Figure 17 it is shown the
IEC09000313_1_en.vsd
Technical manual