...

For this tutorial we are going to create a temperature alarm. This alarm will be triggered when the temperature is over 50 °C. For this example we have a Virtual Item to represent the actual Temperature sensor and another Virtual Item to represent the Alarm Indicator.

Create an alarm

Creating Create an alarm in Web Manager by going to Explorer  Alarms and add a new Alarm; more detail details about creating an alarm can found here. Set the priority accordingly (high, medium, low, or info). 

...

An alarm is acknowledged by pressing the  ✔  button in the Actions column.  

Check the item tree to find that the configured action changed the value of the Alarm indicator item to True.

...