Trend log data records which of the following?

Trend log data records which of the following?

• A. A real-time alarm stream
• B. A schedule for energy use
• C. A list of maintenance tasks
• D. A historical record of sensor and setpoint values

Answer: (D)

Trend log data is all about capturing how measurements change over time. It records historical values of sensors and their setpoints, so you can see trends, verify performance, and diagnose issues by reviewing past conditions. This is different from a real-time alarm stream, which logs events as alarms occur rather than building a time-ordered history. It’s also not a schedule for energy use, which defines when equipment should run, nor a list of maintenance tasks, which tracks upkeep activities. So the historical record of sensor and setpoint values best matches what trend log data records.

Trend log data is all about capturing how measurements change over time. It records historical values of sensors and their setpoints, so you can see trends, verify performance, and diagnose issues by reviewing past conditions. This is different from a real-time alarm stream, which logs events as alarms occur rather than building a time-ordered history. It’s also not a schedule for energy use, which defines when equipment should run, nor a list of maintenance tasks, which tracks upkeep activities. So the historical record of sensor and setpoint values best matches what trend log data records.