Errata exists for this version of the document.
For all Nodes specified in this standard, the Attributes named in Table 3 shall be set as specified in Table 3.
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 server-specific. |
|
Description |
Optionally a server-specific description is provided. |
|
NodeClass |
|
|
NodeId |
The NodeId is described by BrowseNames as defined in 4.1 and defined in OPC 10000-6. |
|
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 standard. |
|
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-specifc and depend on the RolePermissions Attribute (if provided) and the current Session. |
|
AccessRestrictions |
Optionally server-specific access restrictions can be provided. |
For all Objects specified in this standard, the Attributes named in Table 4 shall be set as specified in Table 4.
Table 4 – Common Object Attributes
|
Attribute |
Value |
|
EventNotifier |
Whether the Node can be used to subscribe to Events or not is server-specific. |
For all Variables specified in this standard, the Attributes named in Table 5 shall be set as specified in Table 5.
Table 5 – Common Variable Attributes
|
Attribute |
Value |
|
MinimumSamplingInterval |
Optionally, a server-specific minimum sampling interval is provided. |
|
AccessLevel |
The access level for Variables used for type definitions is server-specific, for all other Variables defined in this standard, the access level shall allow reading; other settings are server-specific. |
|
UserAccessLevel |
The value for the UserAccessLevel Attribute is server-specific. It is assumed that all Variables can be accessed by at least one user. |
|
Value |
For Variables used as InstanceDeclarations, the value is server-specific; otherwise it shall represent the value described in the text. |
|
ArrayDimensions |
If the ValueRank does not identify an array of a specific dimension (i.e. ValueRank <= 0) the ArrayDimensions can either be set to null or the Attribute is missing. This behaviour is server-specific. If the ValueRank specifies an array of a specific dimension (i.e. ValueRank > 0) then the ArrayDimensions Attribute shall be specified in the table defining the Variable. |
|
Historizing |
The value for the Historizing Attribute is server-specific. |
|
AccessLevelEx |
If the AccessLevelEx Attribute is provided, it shall have the bits 8, 9, and 10 set to 0, meaning that read and write operations on an individual Variable are atomic, and arrays can be partly written. |
For all VariableTypes specified in this standard, the Attributes named in Table 6 shall be set as specified in Table 6.
Table 6 – Common VariableType Attributes
|
Attributes |
Value |
|
Value |
Optionally a server-specific default value can be provided. |
|
ArrayDimensions |
If the ValueRank does not identify an array of a specific dimension (i.e. ValueRank <= 0) the ArrayDimensions can either be set to null or the Attribute is missing. This behaviour is server-specific. If the ValueRank specifies an array of a specific dimension (i.e. ValueRank > 0) then the ArrayDimensions Attribute shall be specified in the table defining the VariableType. |
For all Methods specified in this standard, the Attributes named in Table 7 shall be set as specified in Table 7.
Table 7 – Common Method Attributes
|
Attributes |
Value |
|
Executable |
All Methods defined in this specification shall be executable (Executable Attribute set to “True”), unless it is defined differently in the Method definition. |
|
UserExecutable |
The value of the UserExecutable Attribute is server-specific. It is assumed that all Methods can be executed by at least one user. |