A device for recognizing functional units in an electrical system, which is
one of being optional and provided in different construction stages,
respectively, comprising a data processing unit and at least one
functional unit, the functional unit having a function register with a
nonvolatile memory for holding function data, the memory having at least
one function entry with function data associated with the physical
properties of the functional unit, a change in the properties of the
functional unit being recordable by changing the corresponding function
data of the function entry in the function register; and a method of
operating the device.
