UAAccessLevels Enumeration

Indicates how the Value of a Variable can be accessed (read/write) and if it contains current and/or historic data.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ComVisibleAttribute(False)>
<DisplayName2Attribute("OPC-UA Access Levels")>
<FlagsAttribute()>
Public Enum UAAccessLevels 
   Inherits System.Enum
   Implements System.IComparable, System.IConvertible, System.IFormattable

'Usage
 
Dim instance As UAAccessLevels

[ComVisible(false)]
[DisplayName2("OPC-UA Access Levels")]
[Flags()]
public enum UAAccessLevels : System.Enum, System.IComparable, System.IConvertible, System.IFormattable

[ComVisible(false)]
[DisplayName2("OPC-UA Access Levels")]
[Flags()]
public enum class UAAccessLevels : public System.Enum, System.IComparable, System.IConvertible, System.IFormattable

Members

Member	Value	Description
CurrentRead	1	Indicates if the current value is readable. It also indicates if the current value of the Variable is available (0 means not readable, 1 means readable). The value of this enum member is 1.
CurrentReadAndWrite	3	The current value is readable and writable. The value of this enum member is 3.
CurrentWrite	2	Indicates if the current value is writable. It also indicates if the current value of the Variable is available (0 means not writable, 1 means writable). The value of this enum member is 2.
HistoryRead	4	Indicates if the history of the value is readable. It also indicates if the history of the Variable is available via the OPC UA Server. (0 means not readable, 1 means readable). The value of this enum member is 4.
HistoryWrite	8	Indicates if the history of the value is writable. It also indicates if the history of the Variable is available via the OPC UA Server. (0 means not writable, 1 means writable). The value of this enum member is 8.
None	0	No value specified. The value of this enum member is 0.
SemanticChange	16	This flag is set for Properties that define semantic aspects of the parent Node of the Property and where the Property Value, and thus the semantic, may change during operation. (0 means is not a semantic, 1 means is a semantic). The value of this enum member is 16.
StatusWrite	32	Indicates if the current StatusCode of the value is writable (0 means only StatusCode Good is writable, 1 means any StatusCode is writable). The value of this enum member is 32.
TimestampWrite	64	Indicates if the current SourceTimestamp is writable (0 means only null timestamps are writable, 1 means any timestamp value is writable). The value of this enum member is 64.

Remarks

Defines the access levels for OPC UA variables, indicating the capabilities for reading, writing, and historical data access.

Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         OpcLabs.EasyOpc.UA.UAAccessLevels

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

OpcLabs.EasyOpc.UA Namespace

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