The Water Industry Telemetry Standard defines six fundamental point types: Analog Input, Analog Output, Binary Input, Double-bit Binary Input, Binary Output, and Counter. There are also derived points, which are specializations of the fundamental point types, for example, a minimum point is a specialization of an analog input point. For details on the fundamental point types and the derived points, see Automatic Creation of WITS Database Items.
In ClearSCADA, the derived point types have their own database item types, and so ClearSCADA has to be able to convert fundamental points into derived points (and derived points into different types of derived point). For example, an analog input point can be converted into a Minimum point, and a Minimum point can be converted to a Maximum point (another specialization of analog input).
During an import or upload, ClearSCADA converts any points that do not match the type that is being imported or uploaded. However, if you are importing or uploading to a Group Instance, points in the Group Instance cannot be converted as their type is defined by the matching points in the Group Template. This can mean that a configuration import or upload may fail due to ClearSCADA being unable to convert the points. If this occurs, you will need to change the configuration of the points in the Field Device (using a Configuration Application), or you will need to adjust your Group Template strategy (see Using Group Templates with WITS Field Devices).
Further Information