Alarm Concept

The building management system automatically controls and monitors building services plants. Events occur (for example a fault), that are brought to the attention of the operator, or requiring intervention. The alarm system processes such events and reports them accordingly (for example via printer or pager device).

• In some cases, the system may react automatically to a fault, for example, automatically locking a ventilation plant during a fire alarm.
• For control deviations such as a dirty filter, a simple alarm is triggered and only an alarm message is sent.

In both cases, the system switches to an alarm state and a corresponding alarm is issued. After troubleshooting the cause of the alarm, the operator resets the alarm state and the system returns to normal status.

The Desigo CC management platform can manage two types of alarms:

• Field system (FS) alarms
• Management station (MS) alarms
• Discrete alarm type (for example, alarm range between 10 and 20 or between 30 and 40).
• Continuous alarm type (for example, alarm range <=30 or >=70).

These are discussed in more detail in the following sections.