The OPC UA SimpleAttributeOperand type. 更多...
导入语句: | import QtOpcUa |
Since: | QtOpcUa 5.13 |
The SimpleAttributeOperand is specified in OPC-UA part 4, 7.4.4.5. It is used when a node attribute is required as operand.
For example, the following simple attribute operand represents the value of the "Severity" field of the base event type:
import QtOpcUa 5.13 as QtOpcUa QtOpcUa.SimpleAttributeOperand { identifier: "Severity" ns: "http://opcfoundation.org/UA/" }
browsePath : list < OpcUaNodeId > |
Browse path to the node holding the attribute.
import QtOpcUa 5.13 as QtOpcUa QtOpcUA.SimpleAttributeOperand { ... browsePath: [ QtOpcUa.NodeId { identifier: "Message" ns: "http://opcfoundation.org/UA/" } ... ] }
indexRange : string |
Index range string used to identify a single value or subset of the attribute's value.
import QtOpcUa 5.13 as QtOpcUa QtOpcUa.SimpleAttributeOperand { ... indexRange: "0:2" }
nodeAttribute : 常量 . NodeAttribute |
Attribute of the node
browsePath
is pointing to. The default value is
Constants.NodeAttribute.Value
.
import QtOpcUa 5.13 as QtOpcUa QtOpcUa.SimpleAttributeOperand { ... nodeAttribute: QtOpcUa.Constants.NodeAttribute.Value }
typeId : string |
Node id of the type definition node. The operand will be of the type or one of its subtypes. The default value is
"ns=0;i=2041"
.
import QtOpcUa 5.13 as QtOpcUa QtOpcUa.SimpleAttributeOperand { ... typeId: "ns=0;i=2041" }