What is the primary function of the control unit in the system?

• A. Power the system
• B. Provide network connectivity
• C. Monitor the system status and execute system commands
• D. Houses the detectors

Answer: (C)

The control unit serves as the central brain of the system, continuously monitoring sensor inputs and deciding what actions to take. It reads data from detectors and other sensors, checks it against preset limits, and when something out of range is detected, it sends commands to operate equipment—adjusting fans, valves, or pumps, sounding alarms, or isolating a section to keep everything safe. It may also log events and support safe shutdown procedures if needed. This makes it distinct from simply providing power (that’s the power supply), enabling network access (that’s handled by separate communication modules), or housing the detectors (the sensors themselves and their enclosures).