Variables – OPC UA for Computerized Numerical Control (CNC) Systems – for CNC Systems: OPC UA Information Model

For all Variables specified in this specification, the Attributes named in Table 5 shall be set as specified in the table.

Table 5 – Common Variable Attributes

Attribute	Value
MinimumSamplingInterval	Optionally, a vendor-specific minimum sampling interval is provided
AccessLevel	The access level for Variables used for type definitions is vendor-specific, for all other Variables defined in this part, the access level shall allow a current read; other settings are vendor specific.
UserAccessLevel	The value for the UserAccessLevel Attribute is vendor-specific. It is assumed that all Variables can be accessed by at least one user.
Value	For Variables used as InstanceDeclarations, the value is vendor-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 vendor-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.