AVEVA Historian I/O server (classic)

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

The AVEVA Historian I/O Server (classic) is pre-configured with a single topic, Tagname. The AVEVA Historian I/O Server (classic) will listen for clients (such as WWClient or WindowViewer™) that are attempting to establish a connection using the pre-configured topic. After a client connects with the AVEVA Historian I/O Server (classic), a "hot" link is established between the client and the AVEVA Historian I/O Server. For more information on I/O Server addressing conventions, see I/O server addressing in the AVEVA Historian Administration Guide.

For example, the AVEVA Historian I/O Server (classic) could be used by InTouch WindowViewer to access system tag values provided by the AVEVA Historian to monitor system health. You could configure WindowViewer to generate an alarm when abnormal behavior is detected within the AVEVA Historian.

By default, the AVEVA Historian I/O Server (classic) 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 (classic) 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 Historian I/O Server (classic) is a read-only server; clients cannot update data.

The AVEVA Historian I/O Server (classic) 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 (classic).