Alarm trip

An alarm trip is a means used to capture hazards, and to generate alarms thereof.

An alarm trip consists of:

• A sensor providing information about the active system state or the current parameter and
• A rule about the validity of the active state or the current parameter.

Examples - continuous variable

The alarm trip of a boiler consists of:

• A sensor - a thermometer used to measure the boiler temperature (the current parameter)
• A rule - an upper limit about which the measured temperature is risky ( Alarm threshold).

Example - mode compatibility

The alarm trip of a backup pump consists of:

• A sensor used to indicate if the backup pump is available
• A rule about the operational modes in which the backup pump must be available.

Using the trip

A rule is violated when the active state or the current parameter do not comply with the rule.

When the rule is violated, the sensor generates an alarm.

Related topic

Updated on 14 Mar 2017.