What is the purpose of a simple fault-detection rule in BAS?

• A. To identify abnormal operation conditions automatically.
• B. To log data without action.
• C. To prevent any alarms from triggering.
• D. To rename sensors.

Answer: (A)

A simple fault-detection rule in a BAS is designed to automatically identify abnormal operation conditions. It watches how the system behaves against expected ranges or relationships (for example, a pump running with flow much lower than what a normal loop would require, or a temperature sensor reading well outside its typical range). When a deviation is detected, the rule flags it so operators can investigate or the system can take a corrective action, helping catch issues early and keep the system running as intended. Logging data without action doesn’t actively identify faults, and trying to prevent alarms or renaming sensors aren’t about detecting abnormal conditions.