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 server-specific.
For all Nodes specified in this specification, the Attributes named in Table 5 shall be set as specified in the table.
Table 5 – 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 server-specific. |
|
Description |
Optionally a server-specific description is provided. |
|
NodeClass |
|
|
NodeId |
The NodeId is described by BrowseNames as defined in 3.3.2.1. |
|
WriteMask |
Optionally the WriteMaskAttribute can be provided. If the WriteMaskAttribute is provided, it shall set all non-server-specific Attributes to not writable. For example, the DescriptionAttribute may be set to writable since a Server may provide a server-specific description for the Node. The NodeId shall not be writable, because it is defined for each Node in this specification. |
|
UserWriteMask |
Optionally the UserWriteMaskAttribute can be provided. The same rules as for the WriteMaskAttribute apply. |
|
RolePermissions |
Optionally server-specific role permissions can be provided. |
|
UserRolePermissions |
Optionally the role permissions of the current Session can be provided. The value is server-specifc and depend on the RolePermissionsAttribute (if provided) and the current Session. |
|
AccessRestrictions |
Optionally server-specific access restrictions can be provided. |