36
12.5 ISA-F1A Sequence
-
Automatic Reset First-Up
SEQUENCE TABLE
LINE
PROCESS
CONDITION
PUSHBUTTON
OPERATION
SEQUENCE
STATE
VISUAL
DISPLAY
ALARM
AUDIBLE
DEVICE
REMARKS
1
NORMAL
NORMAL
OFF
SILENT
2
FIRST
ABNORMAL
FIRST ALARM
FLASHING
AUDIBLE
LOCK-IN
3
SUB
ABNORMAL
ACKNOWLEDGED
ON
SILENT
NO LOCK-IN
4A
FIRST
ABNORMAL ACKNOWLEDGE
TO LINE 3
MAINTAINED
ALARM
FIRST OUT
RESET
4B
FIRST
NORMAL
ACKNOWLEDGE
TO LINE 3
MOMENTARY
ALARM
FIRST OUT
RESET
5
NORMAL
NORMAL
OFF
SILENT
AUTOMATIC
RESET
SEQUENCE FEATURES
1. ACKNOWLEDGE, AND TEST PUSHBUTTONS
2. ALARM AUDIBLE DEVICE
3. LOCK-IN OF MOMENTARY FIRST ALARM ONLY. NO LOCK IN OF MOMENTARY
SUBSEQUENT ALARMS.
4. FLASHING AND AUDIBLE INDICATIONS FOR FIRST ALARM ONLY. NEW SUBSEQEUNT
ALARMS GO TO THE ACKNOWLEDGE STATE.
5. FIRST OUT INDICATION IS RESET AND THE AUDIBLE IS SILENCED WHEN
ACKNOWLEDGED.
6. AUTOMATIC RESET OF ACKNOWLEDGED ALARM INDICATIONS WHEN PROCESS
CONDITIONS RETURN TO NORMAL
7. OPERATIONAL TEST
NORMAL
NORMAL
SILENT
OFF
SEQUENCE DIAGRAM
SEQ UENCE ISA F1A
(AUTOMATIC RESET FIRST OUT WITH NO SUBSEQUENT ALARM STATE)
PROCESS
AUDIBLE
VISUAL
SILENT
ON
ACKNOWLEDGED
ABNORMAL
AUDIBLE
RETURN
TO NORMAL
SUBSEQUENT
TO ABNORM AL
VISUAL
PROCESS
AUDIBLE
VISUAL
AUDIBLE
FIRST ALARM
FLASH ING
PROCESS
ABNORMAL
ACKNOWLEDGE
WHILE N ORMAL
(FIRST OUT RESET)
FIRST TO
ABN ORMAL
OR NORMAL
SEQUENCE
SEQUENCE
SEQUENCE
A CKNOW LEDGE
WHILE ABNOR MAL
(FIRST OUT RESET)
