Analog statistical summary data
- Last UpdatedAug 09, 2024
- 1 minute read
A custom property analog reference can subscribe to statistics from analog data collected over a defined summary period and saved to the Historian. The following table lists the analog historical statistical data that can be specified for a custom property.
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Analog Statistical Data |
Description |
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Average |
A time-weighted average calculated from values within a summary period. The average is calculated at the end of the summary period. |
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Count |
A value count calculated from values within a summary period. The count is calculated at the end of the summary period. |
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First |
The first value that occurs within a summary period based on the actual timestamp within the summary period. |
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Integral |
An integral value calculated from values within a summary period. The integral is calculated at the end of the summary period. |
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Maximum |
The first maximum value that occurs within a summary period. |
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Minimum |
The first minimum value that occurs within a summary period. |
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PercentGood |
The ratio of labeled "good" quality data to all data within the summary period. The ratio is expressed as a percentage in the range 0 to 100. PercentGood is calculated at the end of the summary period. |
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StdDev |
Time weighted standard deviation calculated from values within a summary period. The value is calculated using time weighted sums (Integrals) and time weighted sums of squares (IntegralOfSquares) values. |
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Last |
The last value that occurred in the summary period based on the actual timestamp within the summary period. |