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====== Cross Data Updates ======

The Alarm Analysis event sink is where import rules are configured. 

Events are processed in a strict FIFO (First In - First Out) sequence. During this phase, the event is parsed purely on the content of the individual record. However, there is a secondary phase called "Cross Data Updates" which works on a wider context by consulting historical data.

Cross Data Updates include the following functions...

{{ :alarm_analysis:crossdatachecks.png?1000|}}

NB. Cross Data Functions incur processing overhead and should only be enabled if required.


===== Dupe Check =====

An event is considered a dupe if if shares the following properties with another event:

  * Timestamp
  * EventType
  * AlarmIdentifier
  * Paramater
  * Priority

If a dupe is identified, the Event Type is updated with a "_Dupe" suffix. The event remains in the Sequence of Events, but is removed from any KPIs.


===== Compile Alarm Properties =====

This process matches up ALMs and RTNs and calculates alarm duration, on-to-on duration, off-to-on duration, and flags if chattering. An alarm is considered chattering if it annunciates 3 or more times within a calendar minute.





===== Calculate Alarm Disabled Properties =====

Alarm Disabled properties include Alarm Disabled Duration.

This can only be calculated if the Alarm Analysis record has properties:

  * EventType: INT (intervention)
  * OpAction: DISABLE_ON or DISABLE_OFF


===== Calculate Manual Mode Properties =====

Manual Mode properties include Manual Mode Duration.

This can only be calculated if the Alarm Analysis record has properties:

  * EventType: INT (intervention)
  * OpAction: MANUAL_ON or MANUAL_OFF