Step 2.3. Modify Source Alarms Default Logging and Deletion Requirements for the Client Display

About this task

Alarms and events from OPC servers are created dynamically based on the following alarms in the client computer Alarms folder.

Alarm	Dynamically creates
$OPC_MODEL_ALARM	Point alarms
$OPC_MODEL_EVENT	Events

You can modify these alarms to change the default behavior for the source alarms.

Procedure

1. Double-click either $OPC_MODEL_ALARM or $OPC_MODEL_EVENT in the Alarms folder on the client computer.
   The Alarm Definition dialog box for the selected alarm opens.
2. Select the Alarm Definition tab.
3. Optional: Check one or more of the Alarm Logging options.
   

   Alarm	Option	Description	Default Value
   $OPC_MODEL_ALARM	Alarm Logging	Alarms are logged to the Alarm log for checked options.	All check boxes are clear.
   $OPC_MODEL_EVENT	Alarm Logging	Event alarms are logged to the Event log for checked options.	All check boxes are clear.

   Note: Do not change the  Alarm class and Alarm type.
4. Select the Alarm Options tab.
5. Optional: Change default options to your system requirements.
   

   Letter	Alarm	Option	Default Value
   A	$OPC_MODEL_ALARM	Deletion requirements
   		Acknowledge	Checked
   		Reset	Checked
   B		Automatic actions
   		Printer repeat	<None>
   		Auto acknowledge	<None>
   		Auto reset	<None>
   C		Manual reset allowed	Clear
   D		Maximum stacked	0
   A	$OPC_MODEL_EVENT	Deletion requirements
   		Acknowledge	Checked
   		Reset	Clear
   B		Automatic actions
   		Printer repeat	<None>
   		Auto acknowledge	<Immediate>
   		Auto reset	<None>
   C		Manual reset allowed	Clear
   D		Maximum stacked	0

   Important:

   • If you change any of these requirements, e.g. check Manual reset allowed, you can delete the Alarm from the client Alarm Viewer display. However, this action is not sent back through the OPC server to the source project.
   • Change the default $OPC_MODEL_EVENT Auto acknowledge to <None> if you want users to view event alarms in the client Alarm Viewer.