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
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The OPC HDA client is only supported for Windows.
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The OPC HDA client supports the OPC HDA specification version 1.20
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The OPC HDA client supports simultaneous connections with up to 32 OPC HDA servers
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The OPC HDA client only supports working with 64Bit OPC HDA servers
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Following OPC HDA data types are supported
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VT_BOOL
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VT_I4
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VT_UI4
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VT_R8
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VT_UI4
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VT_DATE
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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.
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Following of the OPC HDA specification is not supported:
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Aggregate functions
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asynchronous functionality
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update functionality
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Chapter | Description |
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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. |