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 4 shall be set as specified in the table.

Table 4 – 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

Shall reflect the NodeClass of the Node.

NodeId

The NodeId is described by BrowseNames as defined in 3.4.2.1.

WriteMask

Optionally the WriteMask Attribute can be provided. If the WriteMask Attribute is provided, it shall set all non-server-specific Attributes to not writable. For example, the Description Attribute 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 UserWriteMask Attribute can be provided. The same rules as for the WriteMask Attribute 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-specific and depend on the RolePermissions Attribute (if provided) and the current Session.

AccessRestrictions

Optionally server-specific access restrictions can be provided.