Trend Log Configuration in enteliWEB

Quick Answer

Trend logs in enteliWEB record BACnet point values over time to SQL Server. Configure logging by interval (e.g., every 15 minutes) or by COV (on value change). View trends as charts in the browser, overlay multiple points for comparison, and export data to CSV for analysis.

Creating a Trend Log

1. Select a point in the enteliWEB point browser
2. Click Add Trend Log
3. Choose the logging method: Interval or COV
4. For interval logging, set the period (1 min, 5 min, 15 min, 1 hour)
5. For COV logging, set the change threshold
6. Save — enteliWEB begins recording

Viewing Trends

The trend viewer displays a time-series chart with configurable time range, auto-scaling, and zoom controls. Overlay multiple points on one chart to compare related values (e.g., zone temperature vs. discharge air temperature vs. valve position).

Storage and Retention

Trend data is stored in SQL Server. Configure retention globally or per log. Typical retention: 1-3 years at 15-minute intervals for key points. Monitor SQL database size to prevent disk exhaustion.

Export

Export trend data to CSV for analysis in Excel, Power BI, or other tools. Select the time range, points, and export format. For comparison with industrial historian configuration, see how Geo SCADA configures point historian settings.

Best Practices

• Trend zone temperatures, discharge air temperatures, and valve positions at 15-minute intervals
• Use COV logging for binary points (fan status, alarm states)
• Trend outside air temperature for diagnostics and energy analysis
• Keep interval logging at 5-15 minutes — 1-minute logging generates excessive data for most HVAC applications