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
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:
Section 5 1MRK502052-UEN B
Local Human-Machine-Interface LHMI
90
Technical manual
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