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