Analog configuration value (ACnfVal)

Object type analog configuration value (ACnfVal) includes the BACnet properties for one analog configuration value.

There is a dependency between 'Name', 'Description' and 'Naming extension'. Any changes to one impacts the other two properties.

Note:
The dependency can be eliminated by entering a project-specific text.

Example 1:
The preconfigured 'Description' "Supply air humidity" sets the 'Name' to "HuSu" if selected. If "Abs" is selected as a supplement to the 'Naming extension', the description is supplemented by "(Absolut)" to "Supply air humidity (absolute)" and the name becomes "HuSu(Abs)". The name also forms the last element of the object name.

Example 2:
The preconfigured 'Description' "Room temperature" sets the 'Name' to "TR" if selected. Selecting "01" (project-specific text) in addition to 'Naming extension', results in the 'Name' "TR(01)". The name also forms the last element of the object name.

Name
'Name' is a name specific to the instance. It is used to set up a hierarchical object name.
Property ID: 4438

Description
'Description' describes a BACnet object. The 'Description' is a translatable string that is saved internally as a text reference or directly as a string.
Property ID: 28

Name extension
'Name extension' is an optional extension of the name. It uniquely identifies an object or to distinguish objects.
Property ID: 4437

Note
Designations from the text catalog can also be used for the 'Naming extension'.

Trend

Enable Trend
'Enable trend' enables the trend function. A new BACnet object for type TRENDLOG is instantiated, automatically connected to property "Present value" of the selected object and the BACnet properties required for setting are shown in tab "Properties". Yes: Trend function is enabled. No: Trend function is disabled.

Enable logging
'Enable logging' enables trend logging. Logging of data points begins as of the start date and start time is reached. Yes: Logging is enabled. No: Logging is disabled. Trend logging stops if the stop date and stop time are reached or when the buffer is full (if set). Start date and start time (wildcards) are not defined by default. In other words, the setting 'Enable logging' = 'Yes' immediately starts trending.
Property ID: 133

Enable logging

'Enable logging' enables trend logging. Logging of data points begins as of the start date and start time is reached.
Yes: Logging is enabled.
No: Logging is disabled.

Trend logging stops if the stop date and stop time are reached or when the buffer is full (if set).

Start date and start time (wildcards) are not defined by default. In other words, the setting 'Enable logging' = 'Yes' immediately starts trending.

Property ID: 133

Logging Type
'Logging Type' determines when a data point is trended. Polling: The object value is continuously trended at the interval entered in setting 'Logging interval'. Triggered: The object value is trended when the trigger is activated. COV (Change of value): The new value is logged for each change of value ("COV").
Property ID: 197

Logging interval
'Logging interval' determines the interval (cycle) at which the value is logged. The setting takes effect by setting 'polled' for 'Logging Type'.
Property ID: 134

Start time
'Start time' determines the date and time to start trend logging.
Property ID: 142

Stop time
'Stop time' determines the date and time to end trending logging.
Property ID: 143

Stop when full
'Stop when full' determines whether to stop trend logging if the buffer is full. Yes: Logging stops as soon as the buffer is full. No: Logging continues even if the buffer is full. The new values overwrite the oldest values (first in first out).
Property ID: 144

The setting 'Notification threshold' can determine when an event to retrieve data, e.g. by Desigo CC is triggered before the buffer becomes full.

Buffer size
'Buffer size' determines the maximum number of values that can be saved to the buffer. The setting 'Stop if full' determines how to proceed if the buffer is full. Note Property 'Buffer size' can only be changed if 'Enable logging' is 'No'. The value for property 'Buffer size' must be greater than or equal to the value for property 'Notification threshold'.
Property ID: 126

Buffer size

'Buffer size' determines the maximum number of values that can be saved to the buffer. The setting 'Stop if full' determines how to proceed if the buffer is full.

Note
Property 'Buffer size' can only be changed if 'Enable logging' is 'No'.

The value for property 'Buffer size' must be greater than or equal to the value for property 'Notification threshold'.

Property ID: 126

Align intervals
'Align intervals' determines whether the periodic polling interval is aligned at the start of a specific second, minute, hour, or day. The setting has no effect for 'Logging Type' = 'COV'. This ensures that values from multiple, simultaneous trend logs can be saved at the same time and compared. Alignment is only possible for whole number multiples (1…x) of a second, minute, hour, or day.
Property ID: 193

Align intervals

'Align intervals' determines whether the periodic polling interval is aligned at the start of a specific second, minute, hour, or day. The setting has no effect for 'Logging Type' = 'COV'.

This ensures that values from multiple, simultaneous trend logs can be saved at the same time and compared.

Alignment is only possible for whole number multiples (1…x) of a second, minute, hour, or day.

Property ID: 193

Interval offset
'Interval offset', measured in hundredths of a second, permit cyclical trend logs to be spread out. With lots of active trend logs, this prevents a situation where all values are polled at the same time. Polling can be subdivided by staging in groups. 'Interval offset' is only active if the setting 'Align interval' = 'Yes'.
Property ID: 195

Interval offset

'Interval offset', measured in hundredths of a second, permit cyclical trend logs to be spread out.

With lots of active trend logs, this prevents a situation where all values are polled at the same time. Polling can be subdivided by staging in groups.

'Interval offset' is only active if the setting 'Align interval' = 'Yes'.

Property ID: 195

Notification threshold
'Notification threshold ' determine when the buffer sends a request to retrieve data. As soon as the set number of data entries is reached, an event notification is sent for the management station to retrieve the data. Data points are deleted from the buffer after retrieval.
Property ID: 137

Notification threshold

'Notification threshold ' determine when the buffer sends a request to retrieve data.

As soon as the set number of data entries is reached, an event notification is sent for the management station to retrieve the data. Data points are deleted from the buffer after retrieval.

Property ID: 137

Other

Present value
'Present value' indicates the present value of the virtual variable.
Property ID: 85

Change of value, COV ✳
'Change of value, COV' specifies the minimum change in 'Present value' property that will cause a COV notification to be issued to change-of-value subscribers of this object.
Property ID: 22

Suppress fault monitoring
'Suppress fault monitoring' determines whether the fault supervision (fault events) is suppressed ('Yes'/'No'). The setting 'Yes' suppresses the evaluation of 'Reliability' and the value for 'Reliability' remains on "No fault".
Property ID: 357

'Present maximum value'
'Present maximum value' sets the highest value for the present value. Values greater than the configured maximum value are limited to the maximum value.
Property ID: 65

Present minimum value
'Present minimum value' sets the lowest value for the present value. Values less than the configured minimum value are limited to the minimum value.
Property ID: 69

Resolution
'Resolution' indicates the accuracy that a value represents. It defines the smallest recognizable change in engineering units of the property 'Present value' and be modified online. 'Resolution' is typically used for operating and monitoring functions to represent the 'Present value': 'Resolution' can only be an integer > 1. 'Resolution' is only used for an abbreviated depiction on the display, e.g. a station for operating and monitoring. It is not used to shorten the actual value that is processed by the program.
Property ID: 106

Units
'Units' displays the physical unit of 'Present value'.
Property ID: 117