Node properties

The properties of OPC UA nodes are displayed on a separate page. Thematically related properties are combined on individual cards. The last query time is displayed in the toolbar above the view. If necessary, click on Reload to refresh the view and read the latest values from the server.

Node

Node ID

The unique identifier for a specific Node within the OPC UA server’s address space. It consists of a Namespace Index (where the node resides) and an Identifier (which can be a numeric value, a string, a GUID, or an opaque byte string).

Node Class

Defines the fundamental type or category of the node, which dictates what kinds of attributes and relationships it can have.

Browse Name

A non-localized, machine-readable name used by applications to navigate and identify a node within the server hierarchy.

Display Name

A localized, human-readable name for the Node intended to be displayed in the user interface.

Description

An optional text attribute providing additional context, explanation, or help text about the node’s purpose.

Value

These attributes describe the last data value that was received for that particular node, rather than the node itself.

Data Type

Specifies the format and structure of the data contained within a variable node. The following data types are currently supported:

Data type	Description	Example
Boolean	A binary value (true/false).	True, False
Byte	Unsigned integer (0 to 255).	12, 250
Signed Integer / Unsigned Integer	32-bit integer, signed or unsigned.	-2147483648, 2147483647
Signed Long / Unsigned Long	64-bit integer, signed or unsigned.	18446744073709551615
Real / Double	Floating-point numbers for decimals (32-bit or 64-bit precision).	23.5, 3.14159
Character String	A sequence of UTF-8 characters.	"Motor_01", "Active"

Source Timestamp

Indicates the exact time when the data value was originally captured or changed by the underlying data source (e.g., the physical PLC clock or physical sensor).

Source Picoseconds

Provides sub-microsecond resolution for the Source Timestamp, measured in picoseconds (\(10^{-12}\) seconds).

Server Timestamp

Indicates the exact time when the OPC UA server received the data value, or when the server updated the value in its internal cache.

Server Picoseconds

Provides sub-microsecond resolution for the Server Timestamp, measured in picoseconds (\(10^{-12}\) seconds).

Status Code

Indicates the quality and validity of the value and its timestamps.

Status code string	Severity	Meaning
Good	Good	Everything is normal. The value is live and accurate.
Good_Clamped	Good	The value was successful, but it exceeded a limit and was automatically restricted to a maximum/minimum allowable value.
Uncertain_InitialValue	Uncertain	The server has just started up or connected, and this is the last cached value. It hasn’t updated from the physical device yet.
Uncertain_SensorNotAccurate	Uncertain	The communication is working, but the underlying sensor is reporting that its calibration is off or it is operating outside its normal limits.
Bad_NoCommunication	Bad	The OPC UA server is running, but it has completely lost its connection to the underlying hardware (like the PLC or database).
Bad_Timeout	Bad	The client requested data, but the server or the device took too long to respond.
Bad_NodeIdUnknown	Bad	The client requested a specific Node ID, but that ID does not exist in the server’s current address space.
Bad_UserAccessDenied	Bad	The current user logged into the OPC UA browser does not have the security permissions required to read or write this specific tag.

Value

The actual data payload stored in or generated by a variable node.