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 20 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 20: Operating Sequence 3 (LatchedAck-F-S), 2 colors involved
GUID-A652A49D-F016-472D-8D38-6D3E75DAB1DB v2
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 21.
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 21: Operating sequence 3, three colors involved, alternative 1
GUID-071B9EB5-A1D2-49C5-9458-4D21B7E068BE v2
If an indication with higher priority appears after acknowledgment of a lower priority indication
the high priority indication will be shown as not acknowledged according to Figure 22.
Section 5 1MRK 502 066-UUS B
Local Human-Machine-Interface LHMI
98
Technical manual
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