Writes a value into an attribute an OPC server. Only the item value is written (status code and timestamps are not written). Writes value into a Value attribute of a node, specifying an endpoint descriptor, node Id, and attribute Id.
Syntax
'Declaration
<ExtensionAttribute()>
Public Overloads Shared Function WriteValue( _
ByVal As IEasyUAClient, _
ByVal As UAEndpointDescriptor, _
ByVal As UANodeDescriptor, _
ByVal As Object, _
ByVal As UAAttributeId _
) As ValueTuple(Of Boolean,Boolean)
'Usage
Dim client As IEasyUAClient
Dim endpointDescriptor As UAEndpointDescriptor
Dim nodeDescriptor As UANodeDescriptor
Dim value As Object
Dim attributeId As UAAttributeId
Dim value As ValueTuple(Of Boolean,Boolean)
value = IEasyUAClientExtension.WriteValue(client, endpointDescriptor, nodeDescriptor, value, attributeId)
Parameters
- client
- The client object that will perform the operation.
- endpointDescriptor
- Endpoint descriptor. Identifies the OPC-UA server.
- nodeDescriptor
- Node descriptor. Identifies the node in OPC server's address space.
- value
- The value to be written.
- attributeId
- Attribute Id. Identifies an attribute of a node.
Exceptions
| Exception | Description |
|---|
| System.ArgumentNullException |
A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception. |
| System.ComponentModel.InvalidEnumArgumentException |
An invalid enumeration value was used.
This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception. |
| OpcLabs.EasyOpc.UA.OperationModel.UAException |
The OPC UA operation has failed. This operation exception in uniformly used to allow
common handling of various kinds of errors. The System.Exception.InnerException always contains
information about the actual error cause.
This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately. |
Requirements
Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows
See Also
