OPC Studio User's Guide and Reference
OPC-UA Attribute Point
In This Topic

An OPC-UA Attribute Point is a connectivity point that represents an OPC Unified Architecture (OPC-UA) attribute on a node.

Point, Parameters, and Arguments Types

For operations listed below, following classes are used for the point itself, the operation parameters and operation arguments:

Operation Point Type Parameters Type Arguments Type
Read UAAttributePoint Class UAAttributePointReadParameters Class UAAttributePointReadArguments Class
Subscribe UAAttributePointSubscribeParameters Class UAAttributePointSubscribeArguments Class
Write UAAttributePointWriteParameters Class UAAttributePointWriteArguments Class

Type Aliases

You can use following type aliases for this point type:

Friendly Topic Syntax

In order to describe the point and its subscription parameters, use the following sequence:

   EndpointDescriptorString, NodeId [, [AttributeId] [, SamplingInterval]]

Where:

If the point or parameters differ from the default in other properties, the friendly topic syntax cannot be used.

Remarks 

For valid symbolic values of the AttributeId, see UAAttributeId Enumeration Fields.

Examples

   "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/;i=11218"
 
   "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/;i=11218", "DataType"
 
   "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/;i=11218", , "5000"

XML Topic Syntax

The XML topic syntax is capable to fully describe the point and parameters. It is currently not documented, and is subject to change.