DISP2
Rel.: 2.0 - September 2004 - Page 9
7.2- Centralized alarm outputs and “first out”
As said in a previous paragraph, each message of DISP2 may be set for the activation or less of the centralized alarm
outputs (siren and flasher).
If a message has the centralized alarm outputs disabled, then it does not affect the output relays, and the activation of
the related input simply will cause the displaying of the message.
If instead a message has this function enabled, then the siren output relay will be energized and the flasher output relay
will be de-energized at the activation of the related input (or binary code); this means that both signaling devices will be
activated.
To silence the siren press the button
(but the flasher remains activated); the siren will be restarted at the
activation of a new alarm not yet inserted in the queue. Every pressing of the button
will cause the displaying of
the first message in the queue, that is the first occurred event (“first out”).
To reset the flasher, all alarms in the queue must be removed by the reset sequence (if no more inputs or binary codes
are still active).
7.3- Messages displaying in MEM or NOMEM modes
If the NO MEMORY mode has been selected (NOM) the displayed messages show, in direct mode, the current condition
of the inputs in the chronological order they occurred. In binary mode, instead, the message related to the binary code
currently applied to the inputs will be displayed .
If the MEMORY mode has been selected (MEM), the displayed message show the inputs (or binary codes) that have
been activated from last reset sequence, in the chronological order as they occurred.
This last operating mode is the recommended when handling temporary events.
Note that if DISP2 is set for binary mode, the NOMEM setting should be avoided because, as said above, DISP2 will
show only the message related to the currently applied binary code; the NOMEM mode will be instead useful when
DISP2 is connected to an intelligent device (e.g. PLC) and DISP2 is used as a “monitor” of the PLC.
7.4- Reset of the queue
The reset sequence, in MEM mode, allows to clear the displaying queue; this means that all messages in the queue
related to the inputs that are not still active will be removed.
The reset sequence is the following:
¾
Silence the siren pressing the button
¾
Press the button
; DISP2 will display the message as
in the figure here shown
¾
Press the button
within 3 second to confirm the
clearing of the queue
If no confirmation occurs within 3 seconds, then the reset sequence will be automatically aborted.
