Important: You do not have the latest version of Historian! You are missing out on the newest capabilities and enhanced security. For information on all the latest features, see the Historian product page. For more information on upgrades, contact your GE Digital sales agent or e-mail GE Digital Sales Support. For the most up-to-date documentation, go here.

Historian OPC HDA Server Supported Data Types

The following table lists the mapping of data types between Historian and the OPC HDA Server.


Proficy Historian Data Type	OPC HDA Data Type
Single Integer	VT_I2&endash; 16 bit signed integer
Double Integer	VT_I4- 32 bit signed integer
Quad Integer	VT_I8- 64 bit quad integer
Unsigned Single Integer	VT_UI2- 16 bit unsigned single integer
Unsigned Double Integer	VT_UI4- 32 bit unsigned single integer
Unsigned Quad Integer	VT_UI8- 62 bit quad integer
Byte	VT_I1
Boolean	VT_BOOL
SingleFloat	VT_R4- 32 bit float
Double Float	VT_R8- 64 bit double float
Variable String	VT_BSTR
Fixed String	VT_BSTR
Date	VT_DATE
Blob	VT_BSTR