Common Event object (CmnEvt)

"Present value" is an enumerated property. Values include:

• Normal: The alarm list and the fault list are empty.
• Fault: The alarm list and the fault list is not empty.
• Alarm: The alarm list is not empty, and the fault list is empty.
• Fault Alarm: The alarm list and the fault list are not empty.

'Tracking value' represents the uncorrected value as measured by the subsystem. It has the same data type as the 'Present value'.

• It is not limited by 'Present minimum value' and 'Present maximum value'.
• It is not corrected by the correction factor and offset.
• It is updated, even if "Out of service" = 'True' applies.

Property ID: 5107

"State flag" represents four boolean flags ("Out of service", "Overridden", "Fault", "In-Alarm") that indicate the general status of an object.

'Reliability' indicates whether the property value 'Present value' is reliable. If the 'Present value' is not reliable, the property 'Reliability' indicates the cause of the fault and the bit "Fault" of the state indication is set to 'True'. In a normal case, the property 'Reliability' is set to "No fault".

Property ID: 103

"Out of service" allows decoupling the object from being modified by a control program, system program or peripheral device.

• If "Out of service" is TRUE, the properties "Present value" and "Reliability" will no longer be updated by the respective control program, system program or peripheral device.
• If "Out of service" is TRUE, the properties "Present value" and "Reliability" can be modified for simulating and testing purposes.
• If "Out of service" will be changed from FALSE to TRUE, the properties "Present value" and "Reliability" keep their values. Nevertheless, they can be individually modified afterwards.
• If "Out of service" will be changed from TRUE to FALSE, the properties "Present value" and "Reliability" keep their values. They will be modified by the next update of the producer.

Property ID: 81

"Alarm object count" indicates the number of updates to the "Alarm objects list", "Extended fault objects list " and "Fault objects list". It allows client applications to determine that list elements have changed, even if the changes do not result in a change to the Present value.

"Alarm objects list" lists object identifiers for all in-scope Building Automation Objects with Event_State properties equal to OFF_NORMAL.

"Fault object count"

The content of the BA-Aggregated-State object’s Fault-List property includes:

• References to in-scope objects whose Event-State properties are equal to fault state, AND
• References to Associated Aggregated State Objects with non-empty Fault-List properties.

[cASA-4.4-010]

• References to in-scope BA-Objects without alarm detection having Reliability properties equal to a value other than no-fault-detected, AND

NO References to in-scope BA-Aggregated-State objects.

"Fault objects list" is a list of object identifiers for all in-scope Building Automation Objects with Reliability properties equal to a value other than NO_FAULT_DETECTED.

Aggregated State Object property: [Fault_List]

"Extended fault object count"

"Extended fault objects list" contains a list of object identifiers of objects with alarm (Reliability not equal to "No-fault-detected") AND Aggregated-State objects with alarm (Present value equal to fault or fault-alarm).

"Unacknowledged object count"

"Unacknowledged objects list" contains the object identifiers of:

• All in-scope BA-Objects with one or more Acked-Transition bits set to false
• All in-scope BA-Aggregated-State objects with non-empty Unacked-List properties
• All in-scope BA-Aggregated-State objects with related BA-Aggregated-Event-Enrollment objects with one or more Acked-Transition flags set to false

"Commanded object count"

"Commanded objects list" provides a list of in-scope commandable objects with active commands at priority levels 1-8. Commandable objects are objects with Priority-Array properties.

"Out of service object count"

"Out of service objects list" contains the object identifiers of:

• All in-scope BA-Objects with Out-Of-Service properties equal to true
• All in-scope BA-Aggregated-State objects with non-empty Out-Of-Service-List properties

"Overridden object count"

"Overridden objects list" contains the object identifiers of:

• All in-scope BA-Objects with Overridden properties equal to true
• All in-scope BA-Aggregated-State objects with non-empty Overridden-List properties

"Node reference" indicates the object identifier of the parent view node object. The property is set automatically by the engineering system.

'Number of states' defines the number of states that can report 'Present value'.

Property ID: 74

'State text' specifies the enumeration of the multistate value. Preconfigured enumerations can be selected or set to a project-specific enumeration.

Property ID: 110

"Update count" represents the number of times that the "Present value" property has been updated.

• "Update count" will be incremented whenever a value is written to the property "Present value".
• "Update count" will have a value equal to 1 as a default value after a download or object creation to indicate that the object has an initiated valid value.
• When the value of "Update count" reaches its maximum possible value, the next value it takes will be one (wrapping to 1).
• A control program can recognize that the same or a new value has been written to the "Present value" property by reading the current value of "Update count" and comparing it with the previously saved value of "Update count".

"Event state" provides a way to determine if this object has an active event state associated with it. The "Event state" property indicates the event state of the object. Changes in the "Event state" property to the value FAULT are considered to be fault events. If the object does not support intrinsic reporting, then the value of this property is NORMAL.

Property-ID: 36

"Object access level" defines the instance-specific object access level. "Object access level" is used for generic filtering and processing an object by a client application.

• "Object access level" is a configuration property which can only be set up offline (ABT, application configuration).
• "Object access level" is evaluated by client applications such as Technical Operator, DB-Import, and APOGEE Point Team mapping.

Access level

Name

Description

7

Basic operation

Access to BACnet objects and properties for a room user e.g. data points visible on a room unit.

6

Standard operation

Access to BACnet objects and properties for standard operation and monitoring (daily business), .e.g. room and plant information on a management station.

5

Extended operation

Access to BACnet objects and properties for extended operation and monitoring such as network and device objects. All I/Os are visible

4

Administrator

Not used by HQ solutions yet.

3

Basic service

Access to BACnet objects and properties used for commissioning, e.g. configuration value extensions, I/O extensions, etc.

2

Extended service

Not used by HQ solutions yet.

1

Internal

Access to all BACnet objects and properties for very specialized actions e.g. during development.

"Object usage" indicates whether the object is used or unused. The "Object usage" property can hide or display respective objects and their functionality in a client. For example, room functionality can be marked for flexible room arrangements as used/unused. An object that is marked as unused behaves as if the object does not exist.

Property ID: 4930

"Description" is a string of printable characters whose content is not restricted.

"Object name" represents a name for the object that is unique internetwork-wide. The minimum length of the string is one character. The set of characters used in the "Object name" are restricted to printable characters.

"Object identifier" is a numeric code that is used to identify the object. It must be unique internetwork-wide.

"Object type " indicates membership in a particular object type class. E.g. "Analog input", "Binary output", "Event enrollment", "Trend log", etc.

"Building automation profile" is an enumeration that indicates a particular type of Siemens proprietary object. Siemens objects are based on standard BACnet objects. For example, Siemens Analog Input, Analog Output, Analog Calculated Value, and Analog Configuration Value are based on standard Analog Input, Analog Output, and Analog Value BACnet objects.

"Profile name" indicates the name of an object profile to which this object conforms. To ensure uniqueness, a profile name must begin with a vendor identifier code followed by a dash. All subsequent characters are administered by the organization registered with that vendor identifier code. The vendor identifier code that prefixes the profile name indicates the organization that publishes and maintains the profile document named by the remainder of the profile name.

"Event configuration"

Last corresponding object reference is shown.

A string of printable characters whose content is not restricted. (property is only used in ABT Pro)

Version of a copied object (copied from a library). (property is only used in ABT Pro)

Source of a copied object (copied from a library). (property is only used in ABT Pro)