A method for servicing field devices of process automation technology utilizing a device-independent operating program SP running in a computer unit CU and requiring device-specific description files DD1-DD6 for accessing parameters and/or functions of field devices F1-F6, wherein the device-specific description files must be processed by a preprocessing program, during run time of the operating program SP, that preprocessing program IP1 or IP2 is called, which was successfully tested with the corresponding description file DD1-DD6.