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Data Types

The following table lists the data types recommended for use with Historian.

The OPC Classic HDA collector Data Type	Recommended Data Type in Historian
I1- 16 bit signed integer	Single Integer
I4- 32 bit signed integer	Double Integer
R8- 64 bit double float	Single Float
UI2- 16 bit unsigned single integer	Double Float
UI4- 32 bit unsigned double integer	Unsigned Integer
UI8- 64 bit unsigned quad integer	Unsigned Double Integer
I8- 64 bit quad integer	Quad Integer
BSTR	Variable Sting
BOOL	Boolean
I1- 8 bit single integer	Byte

Note: The OPC Classic HDA collector requests data from the OPC Classic HDA server in the native data type. The OPC Classic HDA collector then converts the received value to a Historian Data Type before sending it to the data archiver.