# Alarm sources
The sources of alarms and warnings in the system are:
1. The Alarm limits defined as described in [Alarm Limits](/boomerang-3-domain-administrator-manual/admin/alarms/alarms__alarm_limits.md) which are selected as active in MP settings, in Alarm Limits list.
In the example above S1G1SIM MP has an alarm limit LHA and a warning limit LHW selected. The system will generate the LHW warning if the value is out of \[20;23] range and LHA alarm when the reading is out of \[18;25] range.
2. The Communication alarm filters set in MP settings, which define the time, in minutes, the system will wait for the next MP reading without raising a communication alarm. The system will raise a communication alarm if there will no new reading within this time period. The communication alarm filter must be higher than the log interval.
Both sources are defined during MP creation or edition as described in [Create MP common steps](/boomerang-3-domain-administrator-manual/admin/infrastructure/infrastructure__measuring_points/create-mp-common-steps.md).
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