Minimum value settings

The minimum value settings can be used to display in the application if the value falls below a constant or variable-dependent limit value. The transfer of process variables from the OPC server to the variable server contains additional information in addition to the pure process variable value, including a so-called quality flag. This indicates at runtime if the value falls below the minimum value. The VisiWin control elements receive the quality flag at runtime in the change event, so that a display of a minimum value shortfall can be configured.

Setting	Description of the
Default limit value	A constant as a permitted minimum value (decimal places are separated from pre-decimal places by a dot, e.g.: 1.234). If this parameter is set to the value 0, no limit value monitoring is performed. For variables of type `VT_BSTR`, this parameter is used to define the minimum length of a character string in order to be recognised as valid.
Dynamic	The constant limit value ( Default limit value parameter) is valid. The variable-dependent limit value ( Variable parameter) is valid. Activating this option opens the Select variable dialogue. The selected variable then appears in the Variable parameter. Deactivating the option deletes the setting of the Variable parameter.
Variable	The name of another variable whose current value serves as the lower limit value. The Select variable dialogue is opened via the button.

Parameters for module: