Freeze and unfreeze the Alarm Control grid

You can freeze the Alarm Control to prevent the Alarm control tree from being updated with any further changes.

For example, if new alarms occur while the Alarm Control is frozen, the new alarms are only shown after you unfreeze the Alarm Control.

You can configure a time period after which the Alarm Control automatically unfreezes to avoid the Alarm Control being unknowingly frozen. For example, the operator leaves the workstation and returns without realizing that the Alarm Control is still frozen.

The Alarm Control unfreezes automatically if one of the following changes:

• Alarm Mode

• Alarm Query

• Query Filter

After you unfreeze the Alarm Control, the grid updates with the new alarm records and any other updates while the grid was frozen. You can also use scripting to freeze and unfreeze the Alarm Control grid at run time. For more information, see FreezeDisplay() method.

To freeze or unfreeze the Alarm Control grid

1. Right-click the Alarm Control grid. The shortcut menu appears.

   

   A check mark next to the Freeze option indicates if the grid is currently frozen.

2. Click Freeze. The Alarm Control grid is either frozen or unfrozen.