The Attributes of Nodes, their DataTypes and descriptions are defined in OPC 10000-3. Attributes not marked as optional are mandatory and shall be provided by a Server. The following tables define if the Attribute value is defined by this specification or if it is vendor-specific.
For all Nodes specified in this specification, the Attributes named in Table 3 shall be set as specified in the table.
Table 3 – Common Node Attributes
|
Attribute |
Value |
|
DisplayName |
The DisplayName is a LocalizedText. Each server shall provide the DisplayName identical to the BrowseName of the Node for the LocaleId “en”. Whether the server provides translated names for other LocaleIds is vendor-specific. |
|
Description |
Optionally a vendor-specific description is provided. |
|
NodeClass |
Shall reflect the NodeClass of the Node. |
|
NodeId |
The NodeId is described by BrowseNames as defined in 3.4.3.1 |
|
WriteMask |
Optionally the WriteMask Attribute can be provided. If the WriteMask Attribute is provided, it shall set all non-vendor-specific Attributes to not writable. For example, the Description Attribute may be set to writable since a Server may provide a vendor-specific description for the Node. The NodeId shall not be writable, because it is defined for each Node in this specification. |
|
UserWriteMask |
Optionally the UserWriteMask Attribute can be provided. The same rules as for the WriteMask Attribute apply. |
|
RolePermissions |
Optionally vendor-specific role permissions can be provided. |
|
UserRolePermissions |
Optionally the role permissions of the current Session can be provided. The value is vendor-specific and depend on the RolePermissions Attribute (if provided) and the current Session. |
|
AccessRestrictions |
Optionally vendor-specific access restrictions can be provided. |