A method, apparatus, program and system is provided for storing a desired address in a device of a control system in which at least one device of a first type and one or more devices of a second type are connected to one another via a communication medium for the purpose of interchanging data. An index value and a unique address of a device of the second type are associated to one another and stored in the device of the first type. The association can be automatically retrieved when a device of the second type is replaced with a replacement device, and the new address of the replacement device can be automatically determined based on the association.