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.