From OpenSCADAWiki
Separately taken object controller may contain parameters specified by module types. For example, the parameters of the analog type, the basic information of which is the value of the integer or the real type. Structurally, the parameter is a list of attributes that contain data. Attributes can have five basic types: logical, integer, real, character string (text) and object. Structures of controller objects, parameters and their types are contained in the subsystem "DAQ" so that the module objects carry out their filling in accordance with their own specifics.