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Scadora

History and trends

History

Section titled “History”

Turn on recording in a tag’s History column.

Parameter Meaning
Deadband A value is written only if it changed by more than this
Maximum interval Write at least this often, in seconds

History is stored in segments under %ProgramData%\Scadora\history. Old segments are deleted whole.

"Historian": { "Path": "D:/ScadaData/history", "RetentionDays": 365, "FlushIntervalMs": 1000 }

These settings are in the Scada section of appsettings.json.

Section titled “Trends”

Trends

A trend group is a saved set of pens, axes and an interval. Groups are created in the editor and opened on the Trends page or with ShowTrendGroup.

Trend groups

  • Pens from history and live values.
  • Multiple axes and a percent mode.
  • Pen limits on the chart.
  • Period selection, panning, zoom and pause.
  • A pen table: current value, min, max, mean and deviation.

The Trend element shows the same thing directly on a screen.