From OpenSCADAWiki
Complex object-tag of the signal
The previous sections described the mechanism of connecting the data source as an apparatus object — "Air cooler", which involves combining all the signals in one object of the data source parameter. However, the more common approach to large automation is formation the parameter object around an individual signal, for example — "Temperature at the output of the refrigerator AT101_1 (TE1314_1)", which are often called tags.