IRIS

Intelligent Roadway Information System


Alarms

Select View ➔ Maintenance ➔ Alarms menu item

An alarm is a device which has a boolean state indicating whether or not it is triggered. The description of the alarm might indicate an equipment failure, high temperature, low voltage, etc.

An alarm can be created for controllers using a protocol that generates alarms, such as MnDOT-170.

Events

The state field is set to true when triggered. When it changes, a time-stamped record is added to the alarm_event table. These records are purged automatically when older than the value of the alarm_event_purge_days system attribute.