This structure defines a physical value relative to a X axis and it is used as the DataType of the Value of XYArrayItemType. For details see 5.3.4.3.

Many devices can produce values that can perfectly be represented with a float IEEE 32 bits but, they can position them on the X axis with an accuracy that requires double IEEE 64 bits. For example, the peak value in an absorbance spectrum where the amplitude of the peak can be represented by a float IEEE 32 bits, but its frequency position required 10 digits which implies the use of a double IEEE 64 bits.

Its elements are defined in Table 30.

Table 30 – XVType DataType structure

Name	Type	Description
XVType	structure
x	Double	Position on the X axis of this value
value	Float	The value itself

Its representation in the AddressSpace is defined in Table 31.

Table 31 – XVType definition

Attribute		Value
BrowseName		XVType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of Structure defined in OPC 10000-5.
Conformance Units
Data Access XYArrayItemType