This article shows how to configure Input Alarm and later search for them in the Event search using Web Interface.
There are only 3 different search parameters for Event type search, which are "All", "Motion" and "Alarm". Once can search for any alarms during the set time period and channel and in this way indirectly to filter for Input Alarm (if only Input Alarm triggers Recording for a particular channel). It is not possible to directly narrow the search for particular Alarm type (ex. Input alarm).