From OpenSCADAWiki
Logic level of the data processing
Above we noted, that the type of the data source can vary from a "raw" to the complex. The "raw" means the source, that provides only the basic signals (Integer, Real, Boolean, String, ...) separately. The complex ones refers to the source that groups the signals and, in the parameter of the subsystem "Data acquisition", provides additional attributes that cover practically all diagnostic tasks, that is, the parameter is a completed object, that does not need to be supplemented.