The alarm status page is a diagnostic tool to allow you to view the current state of alarms in the system so you can determine whether the alarm system is working. The
ALARM!SERVICES adapter also hosts a REST web service that can be queried to see similar information about current alarm states. Neither of these features can be used to produce a log of alarm state changes.
When managing alarm configuration, one of the options on that Manager screen is to create a measurement associated with the alarm. The associated measurement produces values of 1 or 0 to indicate when the alarm is raised or cleared, respectively. These values get stored in the STAT historian, so you can use the Historian Trending Tool to export a log of alarm state changes to a CSV file.
There is also a feature of the alarm engine that will write alarm state changes to the openPDC SQL database, in the AlarmLog table. We turned the feature off by default for performance reasons. If you would like to turn that feature on, you can add the
UseAlarmLog=true parameter to the connection string of the