32
12.2 ISA-Sequence A
-
Automatic Reset
SEQUENCE TABLE
LINE
PROCESS
CONDITION
PUSHBUTTON
OPERATION
SEQUENCE
STATE
VISUAL
DISPLAY
ALARM
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
OFF
VISUAL
SEQUENCE ISA A
(LOCK IN)
ABNORMAL
PROCESS
VISUAL
AUDIBLE
ON
SILENT
ACKNOWLEDGED
RETURN
TO NORMAL
PROCESS
ACKNOWLEDGE
WHILE ABNORMAL
VISUAL
AUDIBLE
SILENT
AUDIBLE
ABNORMAL
FLASHING
AUDIBLE
ALARM
ACKNOWLEDGE
WHILE NORMAL
TO
ABNORMAL
SEQUENCE DIAGRAM
NORMAL
NORMAL
PROCESS
OR NORMAL
SEQUENCE
SEQUENCE
SEQUENCE