OPC Foundation
  • Documents
  • NodeSets
  • Search
A.3.2.2 Value

The data values in the DA server are represented as Variant Data type. The COM UA Wrapper converts them to the corresponding OPC UA data type. The mapping is shown in Table A.2:

Table A.2 – DataTypes and mapping

Variant Data

Type (In DA server)

OPC UA

Data type Mapping in COM UA Server (DataValue structure)

VT_I2

Int16

VT_I4

Int32

VT_R4

Float

VT_R8

Double

VT_BSTR

String

VT_BOOL

Boolean

VT_UI1

Byte

VT_I1

SByte

VT_UI2

UInt16

VT_UI4

UInt32

VT_I8

Int64

VT_UI8

UInt64

VT_DATE

Double

VT_DECIMAL

Decimal

VT_ARRAY

Array of OPC UA types

.

Please report errors or issues with the site to webmaster.

Copyright © 2023 - OPC Foundation