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
GUID-DFCA880B-308C-4334-94DF-97C7765E8C13 v5
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 only working in collecting (Coll) mode.
Sequence 5
is working according to Latched type and collecting mode while
Sequence 6
is working
according to Latched type and re-starting (Reset) mode. The letters
S
and
F
in the sequence
names have the meaning
S
= Steady and
F
= Flash.
At the activation of the input signal to any LED, the indication on the corresponding LED obtains a
color that corresponds to the activated input, and operates according to the selected sequence
diagrams shown below.
In the sequence diagrams the different statuses of the LEDs are shown using the following
symbols:
= No indication = Steady light
= Flash
G
= Green
Y
= Yellow
R
= Red
IEC09000311.vsd
IEC09000311 V1 EN-US
Figure 16: Symbols used in the sequence diagrams
Sequence 1
(Follow-S)
SEMOD56072-39 v4
This sequence follows the corresponding input signals all the time with a steady light. It does not
react on acknowledgment or reset. Every LED is independent of the other LEDs in its operation.
Section 5 1MRK 502 066-UUS B
Local Human-Machine-Interface LHMI
96
Technical manual
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