ABB RES670 Technical Manual page 97

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Acknowledgment/reset
• From local HMI
• The active LED indications can be acknowledged/reset manually. Manual
acknowledgment and manual reset have the same meaning and is a common
signal for all the operating sequences and LEDs. The function is positive
edge triggered, not level triggered. The acknowledgment/reset is performed
via the button and menus on the LHMI.
• From function input
• The active LED indications can also be acknowledged/reset via an input,
CLRLEDS, to the function block LHMICTRL. This input can for example be
configured to a binary input operated from an external push button or a
function button. The function is positive edge triggered, not level triggered.
This means that even if the button is continuously pressed, the
acknowledgment/reset only affects indications active at the moment when
the button is first pressed.
• Automatic reset
• The automatic reset can only be performed for LED indications defined for
re-starting mode with the latched sequence type 6 (LatchedReset-S). When
the automatic reset of the LEDs has been performed, still persisting
indications will be indicated with a steady light.
Operating sequence
The sequences can be of type Follow or Latched. For the Follow type, the LED follows
the input signal completely. For the Latched type, each LED latches to the
corresponding input signal until it is reset.
The figures below show the function of available sequences selectable for each LED
separately. The following 6 sequences are available:
• Sequence 1: Follow-S
• Sequence 2: Follow-F
• Sequence 3: LatchedAck-F-S
• Sequence 4: LatchedAck-S-F
• Sequence 5: LatchedColl-S
• Sequence 6: LatchedReset-S
For sequence 1 and 2, which are of the Follow type, the acknowledgment (Ack ) /reset
function is not applicable because the indication shown by the LED follows its input
signal. Sequence 3 and 4, which are of the Latched type with acknowledgement, are
Local Human-Machine-Interface LHMI
Section 5
GUID-E6727E8F-C28B-4295-AE21-BC5643363805 v3
GUID-DFCA880B-308C-4334-94DF-97C7765E8C13 v5
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