Baselines

A baseline is a snapshot of the scheduling case, as represented by tank amounts, compositions and property values, at a certain time during the scheduling period.

Baselines are useful to capture the status of the scheduling case before making changes, so that you can easily compare relevant quantities before and after the changes.

Note: AVEVA recommends that you ensure your database is up to date, by synchronizing your database using the Synchronize pane, before taking a baseline. For more details, see Multi User Collaboration.

Manage baselines

To create a baseline, follow these steps:

1. Click the button. The Add New Baseline dialog opens.

2. Clear the Active check box if you want the baseline to be inactive. You can always change the active status later.

3. In the Time field enter the date and time of the baseline in the scheduling period.

4. Enter a Name for the baseline. The default name is the date and time of the baseline.

5. Optionally, enter a Description for the baseline.

6. Click OK. The Add New Baseline window closes and the new baseline is created.

To edit an existing baseline, select it in the drop-down menu and click the button. The Edit Baseline window opens, which has the same fields as the Add New Baseline window.

To delete a baseline, select it in the drop-down menu and click the button.

The Baseline table fields

Baselines and overrides

When baseline values are overridden and the baseline is active, these overrides are shown on the Overrides pane. Individual override values can have their activity changed using the Overrides pane.

The Baselines page allows overrides to be specified in terms of formulae as well as by entering absolute values.

Tip: To override the inventory of a pipeline via the Override Pipeline Inventory dialog box, right-click on a pipeline row in the baseline and choose Override Pipeline Inventory from the context menu.

Roll forward

7. Adjust the scheduling horizon

   Go to the Settings page.

   

   Configure the Start Date and End Date fields in the Settings page to ensure the correct time horizon is set (see: Duration).

8. Create a baseline

   Go to the Baselines page. Click the button to create a baseline for the new start date and time.

   

9. Re-simulate and review diagnostics

   Re-simulate the schedule based on the new baseline information. Review the generated diagnostics.

   

Remove old data

Reduce the size of your scheduling cases by removing old data no longer relevant to the current scheduling period.

Choose the data to remove by selecting a baseline. The baseline must be before the start of the current scheduling period. All data items fully before the baseline are deleted.

10. In the Baselines page, click Model clean-up in the Maintenance group of the Home ribbon tab. The Model clean-up dialog opens.

    Note that the Model clean-up button is disabled if no suitable baseline exists.

    

11. In the Model clean-up dialog, choose a date corresponding to the baseline you want to use. Days without a baseline appear dimmed.

12. Click OK. A confirmation dialog opens.

13. Click OK. All the data before the baseline are deleted.

Warning: You cannot undo this action.