What is the purpose of time synchronization in BAS, and which standards are used?

• A. Maintains consistent indoor humidity.
• B. Controls lighting schedules.
• C. Monitors energy cost.
• D. Ensures consistent timestamps for data and events; standards include NTP and PTP.

Answer: (D)

Time synchronization in a BAS ensures every device stamps data and events with the same clock, so you can correctly order measurements, correlate information from different subsystems, and perform reliable analysis or fault investigation. With synchronized time, logs from sensors, controllers, and alarms line up, making trend analysis and incident recovery accurate. The standards used to achieve this are NTP (Network Time Protocol) for general network time synchronization and PTP (Precision Time Protocol, IEEE 1588) for higher-precision timing in industrial environments. Other options describe activities that rely on timing, but they don’t address the need for a unified time reference across the system.