ABB RED650, Technical Manual, Page: 84 / 926

The sequence described below is valid only if the same function
block is used for all three colour LEDs.
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 figure
18 it is 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-US
Figure 18: Operating Sequence 3 (LatchedAck-F-S), 2 colors involved
GUID-A652A49D-F016-472D-8D38-6D3E75DAB1DB v3
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 figure
19 .
Activating
signal RED
LED
Acknow.
IEC09000314-1-en.vsd
Activating
signal YELLOW
G
Y R
R Y
Activating
signal GREEN
IEC09000314 V1 EN-US
Figure 19: Operating sequence 3, three colors involved, alternative 1
GUID-071B9EB5-A1D2-49C5-9458-4D21B7E068BE v3
Section 5
1MRK 505 394-UEN A
Local Human-Machine-Interface LHMI
78 Line differential protection RED650 2.2 IEC
Technical manual