AVEVA Historian I/O server

The AVEVA Historian I/O Server (aahIDataService.exe) is the interface for clients to access current data using an IData-compatible protocol. The AVEVA Historian I/O Server can update items with current values for given topics, providing "real-time" I/O Server functionality.

By default, the AVEVA Historian I/O Server runs as a Windows service and can be started and stopped using the Operations Control Management Console. You can also monitor the AVEVA Historian I/O Server from within the Operations Control Management Console. For more information on the Operations Control Management Console, see About Administrative Tools in the AVEVA Historian Administration Guide.

The AVEVA HistorianAVEVA Historian I/O Server is a read-only server; clients cannot update data.

The AVEVA Historian I/O Server sends the original OPC quality as it was stored in the AVEVA Historian. The OPC quality remains the same throughout the system, including storage, retrieval, and the AVEVA Historian I/O Server.