Method of coding functional units for performing different program routines based on installation location by storing physical parameter of functional unit such as impedance as digital address

摘要

When connected to an installation location, each functional unit (2) is assigned a different address. A physical parameter of the functional unit is measured and converted into a digital value. The digital value is stored as a digital address, at least when the functional unit is switched on for the first time after installation. The physical parameter may be a frequency or impedance. The physical parameter may be re-measured each time the functional unit is switched on, and stored as a digital address. An Independent claim is included for an apparatus for coding functional units.