Timer allows you to plan the events in the system. When timer is triggered it goes from the normal state into alarm state. When timer is turned off it goes back to a normal state.
To create a timer go to "Add" in the upper left corner of the web interface, select "Add Timer" . A properties window will appear.
Select timer mode: "Once" - one-time event, "Weekly" - every week, begin time, end time, days when timer is available ( if selected "Weekly") and click "Save".