[DB600] General instruction manual
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6-3
Alarm event type
The alarm event comes in a variety of types as shown below.
SV: Setting value
MV: Output value
AL: Event value
db: Event dead-band
Event output range with "Event standby" set
Normal event output range
Event activation range
Absolute value upper limit alarm
Upper limit alarm against a measured value (PV).
Activation condition
AL < PV
Keep condition
AL - db < PV
≤ AL
Reset condition
PV
≤ AL - db
Absolute value lower limit alarm
Lower limit alarm against a measured value (PV).
Activation condition
AL > PV
Keep condition
AL
≤ PV < AL + db
Reset condition
PV
≥ AL + db
Deviation upper limit alarm
Upper limit alarm against the difference between a setting value (SV) and measured value (PV).
Activation condition
PV > SV + AL
Keep condition
SV + AL - db < PV
≤ SV + AL
Reset condition
PV
≤ SV + AL - db
Deviation lower limit alarm
Lower limit alarm against the difference between a setting value (SV) and measured value (PV).
Activation condition
PV < SV + AL
Keep condition
SV + AL
≤ PV < SV + AL + db
Reset condition
PV > SV + AL + db
Event deadband (db)
Event deadband (db)
Power-ON
Power-ON
Power-ON
Power-ON
Event deadband (db)
Event value (AL)
Event deadband (db)
Event value (AL)