The ProfessionalPLUS station and operator stations (local and remote) as well as the Application Stations (local and remote) are each capable of collecting alarm and event data. The Alarms and Events subsystem helps you maintain event history through an Event Chronicle. An Event Chronicle database stores alarm records, event records, log messages and events from Sequence of Events Cards in event history data sets.
You determine which workstations maintain an active Event Chronicle database and the areas for which the workstation collects the events. The Process History Viewer application enables you to view and query the alarms and event records for any system on the control network.
System-wide events such as logins, logouts, and downloads are always associated with AREA_A in a DeltaV system. This means that AREA_A must be assigned to the Alarms & Events subsystem for those types of events to be recorded. This is true even if you rename AREA_A. The area that was named AREA_A must be assigned to the Alarms and Events subsystem to record system-wide events.