User Manual

Alarm management
Alarm response of the function blocks
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● A FAULT alarm is generated as soon as the [Rlb] property of the function block assumes any value
other than NO_FAULT_DETECTED. In particular, this is the case when [Rlb] changes from a value not
equal to NO_FAULT_DETECTED to another value not equal to NO_FAULT_DETECTED.
● A FAULT alarm will disappear as soon as the [Rlb] property of the function block changes from a value
not equal to NO_FAULT_DETECTED back to the value NO_FAULT_DETECTED.
Trend Log
Alarm response
The Trend Log function has an Intrinsic Reporting mechanism, but does not issue OFFNORMAL alarms.
● A FAULT alarm is generated as soon as the [Rlb] property of the function block assumes any value
other than NO_FAULT_DETECTED. In particular, this is the case when [Rlb] changes from a value not
equal to NO_FAULT_DETECTED to another value not equal to NO_FAULT_DETECTED.
● A FAULT alarm will disappear as soon as the [Rlb] property of the function block changes from a value
not equal to NO_FAULT_DETECTED back to the value NO_FAULT_DETECTED.
Event message
An event is generated when:
● The record count exceeds the record count value [RecCnt] set via the notification threshold [NotifThd],
that is, the local non-volatile trend memory is overflowing.
Event Enrollment
The Event Enrollment object monitors referenced BACnet properties in other objects. The referenced
property can be located in the local device or in another device.
Event algorithms
Monitoring details for a property value are defined by means of event algorithms. An event algorithm has a
specific parameter. Event algorithms are the same as for Intrinsic Reporting. Intrinsic Reporting uses a
subset of the possible event algorithms of Event Enrollment.
Event_Type Event_State Event_Parameters Data type
CHANGE_OF_BITSTRING NORMAL
OFFNORMAL
Time_Delay
Bitmask
List_Of_Bitstring_Values
Unsigned
BIT STRING
list of BIT STRING
CHANGE_OF_STATE NORMAL
OFFNORMAL
Time_Delay
List_Of_Values
Unsigned
list of BACnetPropertyStates
CHANGE_OF_VALUE NORMAL Time_Delay
Bitmask
Referenced_Property_Increment
Unsigned
BIT STRING
choice {BIT STRING, REAL}
COMMAND_FAILURE NORMAL
OFFNORMAL
Time_Delay
Feedback_Property_Reference
Unsigned
BACnetDeviceObjectPropertyRe
ference