AUDIBLE
DEVICE
REMARKS
1 NORMAL NORMAL OFF SILENT
2 ABNORMAL ALARM FLASHING AUDIBLE LOCK-IN
3A ABNORMAL ACKNOWLEDGE ACKNOWLEDGED ON SILENT
MAINTAINED
ALARM
3B NORMAL ACKNOWLEDGE TO LINE 4
MOMENTARY
ALARM
4 NORMAL NORMAL OFF SILENT
AUTOMATIC
RESET
SEQUENCE FEATURES
1. ACKNOWLEDGE AND TEST PUSHBUTTONS
2. ALARM AUDIBLE DEVICE
3. LOCK-IN OF MOMENTARY ALARMS UNTIL ACKNOWLEDGED
4. THE AUDIBLE DEVICE IS SILENCED AND FLASHING STOPS WHEN ACKNOWLEDGED
5. AUTOMATIC RESET OF ACKNOWLEDGED ALARM INDICATIONS WHEN PROCESS
CONDITIONS RETURN TO NORMAL
6. OPERATION TEST
OFFVISUAL
SEQUENCE ISA A
(LOCK IN)
ABNORMALPROCESS
VISUAL
AUDIBLE
ON
SILENT
ACKNOWLEDGED
RETURN
TO NORMAL
PROCESS
ACKNOWLEDGE
WHILE ABNORMAL
VISUAL
AUDIBLE
SILENTAUDIBLE
ABNORMAL
FLASHING
AUDIBLE
ALARM
ACKNOWLEDGE
WHILE NORMAL
TO
ABNORMAL
SEQUENCE DIAGRAM
NORMAL
NORMALPROCESS
OR NORMAL
SEQUENCE
SEQUENCESEQUENCE