10
First-out indication
The annunciator unit is provided with a first-out
indication feature. The alarm channel which
operates first is indicated in the digital display
with a letter A and the channel number. The
first-out indication always relates to the first
incoming alarm after an annunciator acknowl-
edge/reset being performed. The first-out indi-
cation can be reset with the acknowledge/reset
push-button.
Fig. 7. Principle of the first-out alarm indication.
Event register
For evaluating of disturbances, the alarm an-
nunciator unit has been provided with an event
register, which enables the incoming and disap-
pearing alarms to be read out. The register holds
9 events which can be read out on the digital
display step by step using the push-button
↑
.
The latest (youngest) information, i.e. address
No 9, is read out first and then the events are
represented in the display one by one until
address No 1, which represents the oldest infor-
mation, is reached.
Fig. 8. Operating principle of the event register.
Channel 1
Channel 2
Channel 3
Channel 16
First-out
alarm
memory
Reset
Digital display
Not used
Type of event
A = incoming alarm
Channel number
1...16
Chronological order
Decimal point indicates first-
out alarm after previous
acknowledge
Type of event
A = incoming alarm
- = disappering alarm
- - - - = acknowledge
Channel number
1...16
Channel 1
Channel 2
Channel 3
Channel 16
Event
register
Acknowledge
Digital display
Youngest event
The information of the event
register is read out with the
push button