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Syntax
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Point.OnTimed
time_period
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Description
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To poll the points value periodically. A new value will be sent to the application every time_period seconds. The application should call
GetNext
to retrieve the next value.
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Comments
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Unlike the
OnChange
method, you may miss values of the point if it changes in between your polls. Use the
OnChange
method to receive the point whenever it changes.
OnTimed
is useful if the point is rapidly changing and you are only interested in its value in a periodic manner.
Only one of the
OnChange
,
OnAlarm
,
OnTimed
or
OnAlarmAck
requests may be active at a time.
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Parameter
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Description
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time_period
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Integer. Time period in seconds to read the point.
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Example
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Sub main()
??????Dim MyPoint as new Point??????' Declare the point object
??????MyPoint.Id = "TANK_LEVEL"????' Set the point Id
??????MyPoint.OnTimed 60??????????????????' Request value every minute
Top :
????????MyPoint.GetNext??????????????????????' Read the value
????????Trace MyPoint.Value??????????????' Put it out to the trace buffer
????????goto top????????????????????????????????????' Repeat forever
end sub
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See Also
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Point.GetNext (method); Point.OnChange (method); Point.Cancel (method).
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CIMPLICITY
