Barco STELLAR User And Service Manual page 167

N
Alarm sequence 1
Alarm states in
sequence 1
Behavior
Alarm sequence 1
characteristics
Reference
The following figure shows the various states in alarm sequence 1.
Alarm active
0
No Alarm
Alarm inactive
Receive
Attention
Alarm active
3
No Alarm
with Attn
Alarm inactive
The following table shows the behavior of LEDs and relays in alarm sequence 1:
LED or relay
Alarm LEDS
Alarm relays
Receiving Attention relay
Clear relay
The following table shows the characteristics of alarm sequence 1:
Alarm sequence 1 characteristics
Relays indicate unserviced alarms
Relays indicate all alarms
One relay indicates alarms with attention
One relay indicates cleared alarms with attention
Tight control over alarms with attention
Clear relay indication of alarms with or without attention
Relays are used to switch to backup systems during alarm
conditions
Alarm sequence 1 complies with the British Telecom requirements.
Alarm Sequence 1
Active alarms require attention.
1
Alarm
Alarms with attention require a new
without Attn.
attention to be removed.
Alarm LED A
Alarm LED B
Rec. Attn. LED
Receive
Attention
A relay
B relay
C relay
Rec. Attn. Relay
Clear relay
2
Alarm
with Attn.
Indication
Active alarms.
Active alarms with attention.
The presence of alarms, active or inactive, that
have been given attention.
The presence of inactive alarms that were given
attention when they were active.
B
= A alarm(s) in state 1 or 2
= B alarm(s) in state 1 or 2
= No alarms in state 1
AND alarm(s) in state 2 or 3
= A alarm(s) in state 1
= B alarm(s) in state 1
= C alarm(s) in state 1
= alarm(s) in state 2 or 3
= alarm(s) in state 3
Yes
No
Yes
Yes
Yes
No
No
B-3
Alarm sequence 1