These object give information about the main drive and additional drives of the extruder. The DrivesType and DriveType are defined in OPC 40083.
NOTE: Drives are independent from extruder zones. That means that e.g. the value of the vacuum shall be in the VacuumZones and also switching the vacuum shall be inside the VacuumZone. If a vacuum pump is modelled separately as additional drive, this is used for additional information (e.g. Energy).