The flexible XIOS basic hardware allows individual system combinations adapted to customers’ needs. Depending on the requirements of the respective CHP control system, HEINZMANN offers XIOSI/O units of varying scope that are tailored to the XIOSCHP system sizes BASIC, MEDIUM or EXTENDED. The modular construction of these units enables extended modules and additional units to be selected so that additional control functions and numerous I/Os can be used. Inputs and outputs can be defined for specific applications, as the XIOSI/O unit can be expanded by additional I/O modules.