Virtual Tag

A Virtual Tag is a tag that can be associated with a device but whose value is purely internal to Edge ACM. A virtual tag can be assigned a default value that it will assume on start up and will take on and maintain the value of any incoming write to the Tag unless Edge ACM is restarted. . The Virtual tag contains options are shown below.

Configuration

Property	Description

Property	Description
Name	This is the name the Virtual Tag will be given when in the Tag Server layer of eACM
Data Type	The assigned Data Type of the virtual tag
Default Value	The value that the virtual tag will be given on a fresh start of Edge ACM
Enable Backfill	When enabled, the backfill type selected in the Back Fill Type field will be used appropriately. Backfill will not be generated when this is disabled.
Back Fill Type	This allows all value changes for this tag to be stored and published. Always will store every change to the calculation value at the end of a selected interval. If unable to perform calculation at the end of an interval it will instead perform the calculation with data available in the interval. When Triggered will record calculation changes when a tag in the tag group is in a triggered state (High, Low, and Triggered Qualities) at the end of an interval. NOTE: When triggered depends on ‘Backfill on Every Tag when Triggered’ being enabled in the Publish Schedule object in the AUTOSOL MQTT App. When disabled, the ‘When Triggered’ Backfill type will not store changes to the calculation value in the event of a communication outage.
Trigger Conditions	If any exist, the triggers are evaluated on value change and if met, the quality of the tag is updated and Deadband is ignored
Trigger Conditions: Condition	This sets how the current value will be compared to the preset value. There are 5 options available: Equals : will return true if the current value is equal to the preset value in the trigger. Greater Than : will return true if the current value is greater than the preset value in the trigger. Less Than : will return true if the current value is less than the preset value in the trigger. Greater Than or Equal to : will return true if the current value is greater than or equal to the preset value in the trigger. Less Than or Equal to : will return true if the current value is less than or equal to the preset value in the trigger. Percent Change : will return true if the previous value polled and the current value polled have a difference greater than the specified percentage in the trigger.
Trigger Conditions: Value	This sets the value to which the current value will be compared. NOTE: For Percent Change, A value of 5 means a percent change of 5% or greater will return true.
Trigger Conditions: Quality	This sets the quality the tag will take if a trigger is met. There are 3 options available: Triggered : will set the quality to 196. High : will set the quality to 194. Low : will set the quality to 193.
Tag Group	The parent tag group for this tag.