# OPC UA Job Tags and System Tags

Job Tags are user-configurable tags that represent a value stored in the In-Sight job file that you can expose to OPC UA clients. Job Tags are saved within the job file.

System Tags are default tags that are always available on any vision system. The vision systems support the OPC UA Server and you can add them to your configuration. The job file does not store System Tags.

System Tag | Accessibility | Data Type | Description
--- | --- | --- | ---
AcquisitionCount | Read-only | Integer | Returns the number of acquisitions since the vision system powers up.
DiscreteOnline | Read-only | Boolean | Returns False if a Discrete Input line (configured as an Online/Offline Type) is set low (0). Otherwise, returns True. Note: The 3D-L4000 does not have a configurable Discrete Input. Therefore, the tag always returns True.
GuiOnline | Read-only | Boolean | Returns True if the In-Sight Vision Suite GUI is set to Online mode (Sensor Menu > Online).
JobName | Read-only | String | Returns the name of the active job loaded on the vision system, if the user saves the active job before.
LiveMode | Read/Write | Boolean | Reading: Returns True if the system is in Live Video mode. Otherwise, returns False. Writing: Writing any non-zero value to the LiveMode tag places the vision system into Live Video mode. Writing zero to the LiveMode tag exits Live Video mode. Note: If you have the Job View of a vision system open in In-Sight Vision Suite after writing a value of True to the LiveMode tag, In‑Sight Vision Suite does not display the live image and the Job View status bar does not indicate Live Video mode.
NativeOnline | Read/Write | Boolean | Reading: Returns False if the Native Mode Set Online command "SO0" has been issued to the vision system. Otherwise, returns True. Writing: Writing any non-zero value to the NativeOnline tag places the In-Sight vision system Offline via Native Mode (equivalent to issuing the Native Mode Set Online command "SO0"). Writing zero to the NativeOnline tag allows the vision system to be placed Online (equivalent to issuing the Native Mode Set Online command "SO1").
Online | Read-only | Boolean | Returns the logical 'AND' of the following: (DiscreteOnline AND NativeOnline AND GuiOnline).