Element objects contain all information gathered about some OPC entity. They are typically returned by browsing methods.
There are following types of element objects for OPC Classic:
- ServerElement object contains information gathered about an OPC Classic (OPC COM or OPC XML) server.
- AEAttributeElement contains information gathered about an OPC Alarms and Events attribute.
- AECategoryElement contains information gathered about an OPC Alarms and Events category.
- AEConditionElement contains information gathered about an OPC Alarms and Events condition.
- AENodeElement object contains information gathered about an OPC node (areas or source in OPC Alarms and Events server's address space).
- AESubconditionElement contains information gathered about an OPC Alarms and Events subcondition.
- DANodeElement object contains information gathered about an OPC node (branch or leaf in OPC Data Access server's address space).
- DAPropertyElement contains information gathered about an OPC Data Access property.
There are following types of element objects for OPC UA:
- UADiscoveryElement object contains information gathered about an OPC-UA application (OPC-UA server).
- UANodeElement object contains information gathered about an OPC node (in OPC server’s address space). The node can represent e.g. a branch in the organizing tree of nodes, or a process value, or a property.
Element objects are also returned when you invoke one of the common OPC dialogs for selecting OPC server, OPC-DA item or an OPC-DA property.
See Also