8 Standard DataTypes

8.60 AttributeWriteMask

This is a subtype of the UInt32 DataType with the OptionSetValues Property defined. It is used to define the Attribute access restrictions of a Node. The AttributeWriteMask is formally defined in Table 43.

If a bit is set to 0, it means the Attribute is not writable. If a bit is set to 1, it means it is writable. If a Node does not support a specific Attribute, the corresponding bit has to be set to 0.

Table 43 – Bit mask for WriteMask and UserWriteMask

Field	Bit	Description
AccessLevel	0	Indicates if the AccessLevel Attribute is writable.
ArrayDimensions	1	Indicates if the ArrayDimensions Attribute is writable.
BrowseName	2	Indicates if the BrowseName Attribute is writable.
ContainsNoLoops	3	Indicates if the ContainsNoLoops Attribute is writable.
DataType	4	Indicates if the DataType Attribute is writable.
Description	5	Indicates if the Description Attribute is writable.
DisplayName	6	Indicates if the DisplayName Attribute is writable.
EventNotifier	7	Indicates if the EventNotifier Attribute is writable.
Executable	8	Indicates if the Executable Attribute is writable.
Historizing	9	Indicates if the Historizing Attribute is writable.
InverseName	10	Indicates if the InverseName Attribute is writable.
IsAbstract	11	Indicates if the IsAbstract Attribute is writable.
MinimumSamplingInterval	12	Indicates if the MinimumSamplingInterval Attribute is writable.
NodeClass	13	Indicates if the NodeClass Attribute is writable.
NodeId	14	Indicates if the NodeId Attribute is writable.
Symmetric	15	Indicates if the Symmetric Attribute is writable.
UserAccessLevel	16	Indicates if the UserAccessLevel Attribute is writable.
UserExecutable	17	Indicates if the UserExecutable Attribute is writable.
UserWriteMask	18	Indicates if the UserWriteMask Attribute is writable.
ValueRank	19	Indicates if the ValueRank Attribute is writable.
WriteMask	20	Indicates if the WriteMask Attribute is writable.
ValueForVariableType	21	Indicates if the Value Attribute is writable for a VariableType. It does not apply for Variables since this is handled by the AccessLevel and UserAccessLevel Attributes for the Variable. For Variables this bit shall be set to 0.
DataTypeDefinition	22	Indicates if the DataTypeDefinition Attribute is writable.
RolePermissions	23	Indicates if the RolePermissions Attribute is writable.
AccessRestrictions	24	Indicates if the AccessRestrictions Attribute is writable.
AccessLevelEx	25	Indicates if the AccessLevelEx Attribute is writable.
Reserved	26:31	Reserved for future use. Shall always be zero.