Table 1 describes the Analog Output object attributes. These attributes are displayed in alphabetical order. See Object Attributes in the Input and Output Objects section for descriptions of the data provided in this table. Unless otherwise stated, the attributes listed in this table appear in the Details dialog box (for example, the Present Value appears in the Control View below the module name in Simulation and Commissioning modes).
|
Name |
Mode |
Description |
|---|---|---|
|
COV Increment |
Configuration Commissioning |
Indicates the minimum change in Present Value that triggers a new Change of Value (COV) message. Range: 0–100 |
|
Deadband |
Configuration Commissioning |
Specifies the range around the current output outside which the calculation of a new output must fall before the attribute is updated. A deadband of 0 allows the value to reflect all changes to Present Value. The low and high values for the Deadband range are calculated this way: Low value: Output - (1/2 * Deadband attribute) High value: Output + (1/2 * Deadband attribute)
Note: If Present Value equals or is outside Min Value or Max Value, Deadband is ignored. Deadband is enabled again after value changes from Min Out Value or Max Out Value. This allows the deadband to be set to either Min Out Value or Max Out Value.
Range: 0–100 |
|
Description |
All Modes |
Indicates the description provided for the object. |
|
Device Type |
Configuration Commissioning |
Describes the physical network device to which the object is connected. |
|
Display Precision |
Configuration Commissioning |
Indicates the point at which value attributes are rounded for display (and how many numbers following the decimal point appear). Set Name: Display Precision |
|
Max Out Value |
Configuration Commissioning |
Specifies the value for the output when Present Value (appears as I1) is greater than or equal to Max Value. Range: 0 -100 |
|
Max Value |
Configuration Commissioning |
Represents the upper limit for Present Value (appears as I1) when it is used to calculate output. If Present Value is higher than the value specified in this attribute, Present Value assumes the value of Max Value.
Note: This attribute does not affect the value of the Present Value attribute, only the impact Present Value has on Output calculation.
If the Present Value amount used in the Output calculation equals Max Value, Output equals the Max Out Value. Max Value must be greater than Min Value. Units: See Units. |
|
Min Change to Send |
All Modes |
Indicates the array of floating values (each value corresponding to a single Input) to specify the minimum change in the Input that is sent to the destination. This attribute is only applicable when the input is of floating-point data type. The change is evaluated by comparing the current value of the Input to the value the last time a message was sent to the destination. |
|
Min Out Value |
Configuration Commissioning |
Specifies the value for the output when Present Value (appears as I1) is less than or equal to Min Value. Range: 0–100 |
|
Min Value |
Configuration Commissioning |
Represents the lower limit for Present Value (appears as I1) when it is used to calculate output. If Present Value is lower than the value specified in this attribute, Present Value assumes the value of Min Value.
Note: This attribute does not affect the value of the Present Value attribute, only the impact Present Value has on Output calculation.
If the Present Value amount used in the Output calculation equals Min Value, Output equals the Min Out Value. Min Value must be less than the Max Value. This attribute resets to the default value if you edit the Units attribute. Units: See Units. |
|
Name |
All Modes |
Indicates the name of the object. |
|
Object Identifier |
All Modes |
Indicates the instance number of the Object Type as exposed to the network. The Object Identifier must be unique within the host device. The Object Identifier is created after defining hardware in the Hardware Definition Wizard accessible from the Define Hardware button or Operations menu option. The Object Identifier consists of the BACnet Class ID and the object’s Instance Number separated by a colon. For example, an Object Identifier of AV.10026 has a BACnet Class ID of AV and an Instance Number of 10026. |
|
Offline |
Commissioning |
Indicates if the object is currently communicating with the network device. This attribute is visible in an SAB device. |
|
Out of Service |
Commissioning |
Indicates whether the object is currently connected to the hardware or offline (out of service). This attribute is visible in an SAB device. |
|
Present Value (Appears as I1) |
Simulation Commissioning |
Indicates the current value (with the highest priority) being sent to this object. Present Value is used to calculate the output.
Note: During this calculation, Present Value is restricted between Min Value and Max Value; however, the value represented in the Present Value attribute is not restricted.
Default Value: See Relinquish Default. Units: See Units. This attribute is a Default Element. |
|
Priority |
All Modes |
Sends the output at the BACnet priority indicated by the value of the priority input. |
|
Reliability |
Simulation Commissioning |
Provides the following values to indicate whether or not the Present Value (appears as I1) is reliable:
If an Out of Service command is received, this attribute is Reliable. Only when the object is out of service can you write values to this attribute. Set Name: Reliability This attributed is a calculated value (Output). |
|
Relinquish Default |
Configuration Commissioning |
Contains the default value for Present Value (appears as I1) when all priorities are released. The Present Value is sent to the value in Relinquish Default only at startup or when the last priority value is released. Present Value does not update if you change Relinquish Default. Units: See Units. |
|
Restore Command Priority |
Configuration Commissioning |
Restores the commands you select in the case of a power failure. For more information about command priorities, see Command Priority Levels. The following list displays the command priorities you can select.
|
|
Status |
Simulation Commissioning |
Reflects the status of the object based on the Reliability attribute and the status of any commands. Possible values for Analog Output objects are:
Set Name: Status This attributed is a calculated value (Output). |
|
Units |
Configuration Commissioning |
Indicates the units of measurement for Present Value (appears as I1), Min Value, and Max Value. This attribute resets to the default value if you edit the Setup attribute. Set Name: Unit |
|
Use COV Min Send Time |
Configuration Commissioning |
Configures the object to send COV messages on a periodic basis instead of on every change of value that exceeds the COV Increment. This attribute is typically set to True for objects with values that fluctuate greatly, such as air pressure, to decrease the number of COV messages. The change of value still must exceed the COV Increment to be reported. The Min Send Time value is set at the supervisory controller on the Device object, and has a default of 15 seconds. |
|
Use Default if Not Reliable |
All Modes |
Specifies the behavior when the Input is not reliable. If True, the destination is sent the Input’s Default Value whenever the Input is not reliable and its Reliability is marked as Reliable. If False, the destination is not updated and keeps its last reliable value. |