User Manual

Alarm management
Alarm functions
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CM110664en_07 153 | 351
Event_Type Event_State Event_Parameters Data type
FLOATING_LIMIT NORMAL
HIGH_LIMIT
LOW_LIMIT
Time_Delay
Setpoint_Reference
Low_Diff_Limit
High_Diff_Limit
Deadband
Unsigned
BACnetDeviceObjectPropertyRe
ference
REAL
REAL
REAL
OUT_OF_RANGE NORMAL
HIGH_LIMIT
LOW_LIMIT
Time_Delay
Low_Limit
High_Limit
Deadband
Unsigned
REAL
REAL
REAL
BUFFER_READY NORMAL Notification_Threshold
Previous_Notification_Count
Unsigned
Unsigned
CHANGE_OF_LIFE_SAFETY NORMAL
OFFNORMAL
LIFE_SAFETY_ALARM
Time_Delay
List_Of_Alarm_Values
List_Of_Life_Safety_Alarm_Valu
es
Mode_Property_Reference
Unsigned
list of BACnetLifeSafetyState
list of BACnetLifeSafetyState
BACnetDeviceObjectPropertyRe
ference
EXTENDED Any BACnetEventState Vendor_Id
Extended_Event_Type
Parameters
Unsigned
Unsigned
Extended_Event_Type
UNSIGNED_RANGE NORMAL
HIGH_LIMIT
LOW_LIMIT
Time_Delay
Low_Limit
High_Limit
Unsigned
Unsigned
Unsigned
Event notification
An Event Enrollment object also monitors the status flag property of an object with referenced property. If
the FAULT flag of the referenced object is set, the Event Enrollment object generates a Fault alarm.
Loop object
Alarm response
The Loop object contains intrinsic reporting.
An OFFNORMAL alarm occurs when:
● [XCtr] exceeds the limit (SetPoint + ErrorLimit) longer than the specified time (HIGH_LIMIT) defined in
variable [TiMonDvn]
● [XCtr] drops below the limit (SetPoint – ErrorLimit) longer than the specified time (LOW_LIMIT) defined
in variable [TiMonDvn]
An existing OFFNORMAL alarm (HIGH_LIMIT) disappears again when [XCtr] drops below the value
(SetPoint + ErrorLimit – Deadband) longer than the specified time defined in variable [TiMonDvn].
An existing OFFNORMAL alarm (LOW_LIMIT) disappears again when [XCtr] exceeds the value (SetPoint –
ErrorLimit + Deadband) longer than the specified time defined in variable [TiMonDvn].
FAULT alarm:
● A FAULT alarm occurs immediately as soon as [Rlb] of the function block has a value other than
NO_FAULT_DETECTED. This is true in particular when [Rlb] changes from a value that is not equal to
NO_FAULT_DETECTED to another value that is not equal to NO_FAULT_DETECTED.
● A FAULT alarm disappears immediately as soon as [Rlb] of the function block changes again from a
value that is unequal to NO_FAULT_DETECTED to the value NO_FAULT_DETECTED.
9.5 Alarm functions
Depending on the type and degree of urgency of the alarm, the system user may be required to
acknowledge a change in the alarm state with an explicit operator action.
Acknowledgement
There are two types of acknowledgement: