Clearing COMM_ALM alarms when a fieldbus device is removed from the segment

When a commissioned fieldbus device is permanently removed from the segment physically, it may generate a COMM_ALM alarm. In applications where the device is no longer needed, the device placeholder may also be deleted. Despite the physical removal of the device and the deletion of the placeholder, the alarm is not automatically removed from the operator environment and attempts to acknowledge the alarm generate an Item Not Found error.

Follow these steps to clear the COMM_ALM alarm that is generated when a fieldbus device is removed from the segment:

Reattach the fieldbus device to the segment and then recreate the alarm to acknowledge the COMM alarm, if possible.
If the process permits, perform a total download of the controller where the device was previously assigned.
If the fieldbus device can no longer be reattached to the segment and a total download of the controller is not possible, perform the following steps:
1. Open the fieldbus device's Properties dialog in DeltaV Explorer and select the Alarms and Display tab.
2. Take note of the area indicated in the All device alarms associated with area: field.
3. Decommission and delete the fieldbus device placeholder.
4. Create a control module under the area seen in the All device alarms associated with area: field.
5. Name the new control module with the same tag as the device that was just deleted.
6. Create an alarm in the control module and name it COMM_ALM.
7. Assign the control module to the controller where the fieldbus device was previously assigned.
8. Save and download the control module.
9. Acknowledge the alarm and delete the newly configured control module.