Compare multiple events

The event-comparison page shows overlay trends plotting the behavior of each event attribute during multiple related events.

By default, when an event-comparison page is created, it contains overlay trends for each attribute that matches all of the following criteria:

• Appears on your AVEVA PI Vision display.

• Belongs to the referenced asset of the event you selected for comparison in the Events pane.

• Uses a numeric data type.

To compare events:

1. In the Events pane, right-click the event you want to compare and click either Compare Similar Events By Name or Compare Similar Events By Type.

   When comparing events by name, the event-comparison page displays up to 11 events with the same name, event type, and referenced asset. When comparing events by type, the event-comparison page displays up to 11 events based on the same type and same referenced asset.

   

   If an event is currently "in-progress", it will have a legend marker symbol at the end of its trace, and the overlay trend will show a green circle next to its title.

   

2. Select an event from the list to highlight its trace on the overlay trend and view its start and end time.

   

   Each event is color-coded and has a legend marker next to its name to help you locate the event on the overlay trend and the Gantt chart.

3. Click anywhere on the overlay trend to view a trend cursor. You can add multiple cursors.

   When an attribute is selected, the cursors show that attribute value for every event on the trend. If no attribute is selected when the cursor is added, the first attribute is selected automatically. Each value is shown in the same color as its corresponding trace, and values are listed in the order they appear in the Events pane. When an event is selected, the cursors show all attribute values for that one event in the order they appear in the toolbar. When you select a different event or attribute, the cursor is updated to reflect that selection.

4. To hide an event, right-click the event in the Events pane and click Hide Event.

   You can also right-click the event's color-coded bar in the Gantt chart and click Hide Event.

   The event will be hidden on each overlay trend and the Gantt chart, and will be grayed out in the Events pane.

5. To show a hidden event, right-click the grayed-out event in the Events pane and click Show Event.

6. To delete an overlay trend, click the X icon next to the trend's title.