User guide

AN24 & AN28 Annunciators Instruction Manual
34
ISA Sequence F1A
First-Out Indication with Acknowledge Pushbutton, No Lock-In of
Subsequent Alarms, and Automatic Reset
Momentary Alarm Maintained Alarm
Sequence F1A Sequence F1A Flowchart
Switch Positions
Condition LED Horn Condition LED Horn
1
st
Pt Next Pt 1
st
Pt Next Pt
Normal
Off Off Off
Normal
Off Off Off
Alert
Flash Steady On
Alert
Flash Steady On
Normal
Flash Off On ACK Pushbutton
ACK Pushbutton
Acknowledge
Steady Steady Off
Acknowledge
Off Off Off
Normal
Off Off Off
Ack
Pressed
Condition Normal
1
st
Pt LED Off
Next Pt LED Off
Horn Off
Condition Alert
1
st
Pt LED Flash
Next Pt LED Steady
Horn On
Condition Alert
1
st
Pt LED Steady
Next Pt LED Steady
Horn Off
A
larm Condition
Return
to Normal
Ack
Pressed
Condition Normal
1
st
Pt L D Flash
Next Pt LED Off
Horn On
Return
to Normal