In fire alarm systems, what is the primary function of a supervisory signal?

The primary function of a supervisory signal in fire alarm systems is to indicate the integrity of system components. Supervisory signals are used to monitor various aspects of the fire alarm system and can alert the system to issues such as a faulty component, a failure in the wiring, or problems with power supply. This monitoring is crucial for ensuring that the fire alarm system is fully operational and capable of effectively responding to an emergency.

In contrast to other functions, supervisory signals do not necessarily alert building occupants directly to a fire, nor do they initiate evacuation procedures. Instead, they serve as a tool for system management and maintenance, helping to prevent malfunctions that could impede the system's ability to function during an actual fire event. Additionally, while controlling building access is a critical function in some security systems, it is not a primary role of supervisory signals within the context of fire alarm systems.