TrnSetPeriod
Sets the display period (time base) of a trend. When the period is changed, CitectSCADA reads the historical data to reconstruct the trend data, and refreshes the trend. Every pen has the same display period.
This function clears the span set by the TrnSetSpan() function.
Syntax
TrnSetPeriod(AN, Period)
AN:
The AN where the trend is located. Set to -1 for every trend on the current page.
Period:
The new sampling period (in seconds) of the trend. To set the display period to the sampling period, set this argument to 0 (zero),
Return Value
0 (zero) if successful, otherwise an error is returned.
Related Functions
TrnGetPeriod, TrnEcho, TrendSetTimebase, TrendSetSpan
Example
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System Keyboard |
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Key Sequence |
## Enter |
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Command |
TrnSetPeriod(20, Arg1) |
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Comment |
Set a new sampling period for the trend at AN20 |
See Also