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AVEVA™ Historian

View events and alarms on a line chart

  • Last UpdatedSep 10, 2024
  • 3 minute read

If a line chart is configured with tags associated with events or alarms occurring within the selected timeframe, those items will be displayed on the chart. You can view detailed information on an event or alarm by selecting the icon on the chart.

A line chart with event details shown

When a tag is in an alarm state, the state is displayed as a highlighted line that begins where the alarm starts and ends where the alarm is cleared. If the start or clear events occur outside the selected timeframe for the alarm, the line will still display. However, no highlighting will appear if both the start and clear events occur outside of the selected timeframe.

The color of the highlighting corresponds to the severity of the event:

  • Severity 1 - Red

  • Severity 2 - Yellow

  • Severity 3 - Blue

  • Severity 4 - Pink

Below are descriptions of the icons that can appear on the line chart:

Alarm acknowledge events icon

Alarm Acknowledge event

Displayed at the point in time when an alarm is acknowledged.

Event_icon

Application Write event

Displayed at the point in time when the application records an event.

User write icon

User Write event

Displayed at the point in time when a user records an event.

User write secured_icon

User Write Secured event

Displayed at the point in time when a User.Write.Secured event occurs.

User write verified icon

User Write Verified event

Displayed at the point in time when a User.Write.Verified event occurs.

Multiple events icon

Simplified events

Displayed in place of individual event or alarm icons if any tag displayed has more than 30 events for the timeframe shown. Zoom in to restore individual event or alarm icons.

Simplified events are also used when viewing the content from the home page or from a dashboard. Detailed information on events and alarms are only available when viewing the chart in the content editor view.

If more than 100 events per tag occur within the displayed timeframe, no icons will be displayed. Zoom in to see more details.

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