Monitoring a signal with a LED is a simple mode, where the LED follows the signal
state. More than one signal per LED can be used when applicable. See Figure 46 for
the valid priority rules. The LED illuminates always in steady state.
LED operation mode Follow-F
IEC08000396.vsd
= Steady = FlashIllumination =>
R
Y
G
R
Y
G
S
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L
E
D
IEC08000396 V1 EN
Figure 47: LHMI: LED operation mode Follow-F
This is the same mode as Follow-S but the LED illuminates flashing, see Figure 47.
This mode may be used to indicate that a tap changer or Petersen coil is moving.
LED operation mode LatchedAck-F-S
IEC08000397.vsd
R
Y
G
R
Y
G
S
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Ack
= Steady = FlashIllumination =>
IEC08000397 V1 EN
Figure 48: LHMI: LED operation mode LatchedAck-F-S / Base
The classical mode to indicate incoming alarms or warnings, which the operator has
not seen since the last acknowledgement, is presented in Figure 48 as a basic operation
mode. Two possibilities for the operator to acknowledge:
• The signal is already gone when acknowledged, the LED turns OFF (at least for
this color).
• The signal is still ON, the LED stays illuminated and changes to steady state.
1MRK 511 284-UEN A Section 6
Local HMI engineering
650 series 69
Engineering manual
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