Time deadband (wwTimeDeadband)

A time deadband for retrieval controls the time resolution of data returned in delta mode. Any value changes that occur within the time deadband are not returned.

Time deadbands can be applied to analog, discrete, and string tags.

The deadband "base value" is reset each time that a value is returned, so that the last value returned acts as the basis for the deadband.

The following illustration shows an example of applying a time deadband:

Data is retrieved for the time period starting with TS and ending with TE. All points in the graphic represent data values stored on the historian. The gray areas represent the time deadband, which starts anew with every returned value. Only the green points (P2, P4, P7, P8, P9, P11) are returned. The other points are not returned because they fall within a deadband.