The Limit Configuration tab allows you to define limit groups and corresponding limit sets and limit bands. The measurements modeled in these limit groups trigger associated quality codes and alarms when values fall into non-normal bands.
Understanding the Limit Groups Table
The Limit Groups table has the following columns:
• The ID column displays the limit group number. This is a non‑editable field that corresponds to the measurement limit_group_id field and is here for reference purposes.
• The Group Name column displays the Limit Group name.
• The Description column displays the description given to the Limit Group.
Buttons
• Add Limit Group...: Displays a dialog box that allows you to add a limit group.
• Edit Limit Group...: Displays a dialog box that allows you to edit the selected limit group.
• Remove Limit Group...: Removes the selected limit group.
• Refresh: Refreshes the entire tab.
• Service Recache: Notifies DDService to reload the new limit groups.
• Export Configuration...: Displays the SQL needed to create the data displayed in this tab.
Note: Limit group IDs need to be unique.
Understanding the Limit Sets Table
The Limit Sets table is displayed when a row is selected in the Limit Groups table. It has the following columns:
• The Set ID column displays the limit set ID.
• The Set Name column displays the limit set name.
• The Type column displays whether this limit set should use the value of the measurement, or a percentage. Percentages are only supported against the amp rating or nominal voltage.
• The Hysteresis column displays the value threshold past the limit needed to exit a non-normal limit band.
Buttons
• Add Limit Set...: Displays a dialog box that allows you to add a limit set for the selected group.
• Edit Limit Set...: Displays a dialog box that allows you to edit the selected limit set.
• Remove Limit Set...: Removes the limit set from the selected group.
Note: A limit set ID can only exist once in a single limit group.
Understanding the Limit Bands Table
The Limit Bands table is displayed when a row is selected in the Limit Set table. It has the following columns:
• The Band ID column displays the limit band ID.
• The Band Name column displays the limit band name.
• The Min Value column displays the minimum value of this band.
• The Max Value column displays the maximum value of this band.
• The Description column displays the band description.
• The Priority column displays the priority used in the resulting alarm.
• The Enabled column displays whether the band is active.
Buttons
• Add Limit Band...: Displays a dialog box that allows you to add a limit band.
• Edit Limit Band…: Displays the Add/Edit Limit Band dialog box to edit the parameters of the selected Limit Band.
• Remove Limit Band...: Displays a dialog box that will allow you to remove the selected limit band or cancel the action.
Note: A limit band ID can only exist once in a single limit set. The band IDs should have no gaps between them.