Update the last good values

The Last Good Value data in the External Data Manager provides a set of good quality tag values that you can fall back on if the current tag values from the external database have a bad quality status. Typically, you update the last good values after you set the model variables to the screened tag values and your simulation solves without errors.

The Last Good Value data in the External Data Manager always appears in the internal units of measure (UOMs). You may need to convert a Last Good Value to accurately compare it to a Tag Value or Sim Value. See Internal units of measure for more information.

Update the last good values

1. Open the External Data Manager.

2. Select the tag collection that contains the tag values of interest, and then select Transfer.

   The Read/Write External Data window appears.

3. In the Tag List section, in the Input Processing area, select Set.

   AVEVA Process Simulation sets the Last Good Value data to the Screened Value data. If a Screened Value is blank, the software does not update the associated Last Good Value.