Hysteresis
The definition of a hysteresis in the trend can be used for data compression. Process variable values are only written to the archive if they change by a value specified in the Hysteresis parameter compared to the last saved value. The hysteresis value can be specified in absolute or relative terms (see also parameter Mode (hysteresis)).
The parameter accepts the following inputs:
|
Type |
Description of the |
|---|---|
|
Number |
A constant (decimal places are separated from pre-decimal places by a dot, e.g.: 1.234) |
|
Text |
The name of another process variable whose current value is archived instead of the actual value. A dialogue for selecting a process variable is opened in the editor via the |
button.Parameters for module: