OPC HDA Client

The WinCC OA OPC (OLE for Process Control) HDA client allows to query, display and save historical data from OPC HDA servers.

Notes and restrictions

  • The OPC HDA client is only supported for Windows.

  • The OPC HDA client supports the OPC HDA specification version 1.20

  • The OPC HDA client supports simultaneous connections with up to 32 OPC HDA servers

  • The OPC HDA client only supports working with 64Bit OPC HDA servers

  • Following OPC HDA data types are supported

    • VT_BOOL

    • VT_I4

    • VT_UI4

    • VT_R8

    • VT_UI4

    • VT_DATE

  • The debug flag -dbg 10 provides information if the server list is changed, the connection to a server is lost or a state/browse request is performed.

  • Following of the OPC HDA specification is not supported:

    • Aggregate functions

    • asynchronous functionality

    • update functionality

Chapter Description
OPC HDA Client General information and notes regarding the WinCC OA OPC HDA client.
Requirements and Installation Requirements for using WinCC OA OPC HDA client.
Configuration of the OPC HDA Client Information on creating and configuring the OPC HDA client.
DCOM settings for Remote Servers Registration of a Remote Server
Query historical data Options to query historical data.
Possible config entries for the OPC HDA client Possible config entries for the OPC HDA client.
Internal data points Description of the internal data points.
Redundancy Information on using the OPC HDA client in redundant projects.