Procedure designed for the reconfiguration of a field device electronics module of a field device for the generation of at least a measuring signal (x 12) representing at one process measured variable (x 11), particularly a level in a vessel, a volume flow and/or mass flow of a flowing fluid or a pressure, a pH value and/or a temperature of a medium, wherein the field device features the field device electronics module and a measured value sensor connected to the field device electronics module and reacting to the process measured variable (x 11), - wherein the field device electronics module comprises: -- a non-volatile data memory circuit for the persistent storage of software --- with an activated first memory area for a first program code (C 151) representing a first configuration of the field device electronics module and --- with a deactivated second memory area for a second program code (C 152) representing a second configuration of the field device electronics module and -- a control circuit that generates a selection signal (X 14) that serves to deactivate the first memory area and activate the second memory area; - and wherein the measured value sensor is a Coriolis mass flow sensor or an electromagnetic volume flow sensor or a pressure transmitter or a pH electrode arrangement or a temperature sensor or a level sensor, wherein said procedure comprises the following steps (100, 200, 401,201, 203, 500): - a first program code (C 151) stored in an activated first memory area of the data memory circuit and representing a first configuration of the field device electronics module is executed by a computing process, - a first configuration process is started and registered in a coordination process, - the coordination process exclusively grants the first configuration process data write-access to a second memory area of the data memory circuit, - the first configuration process transmits modification data to the second memory area, said data being used to create a second program code (C 152) that represents a second configuration of the field device electronics module, and - the coordination process deactivates the first memory area and activates the second memory area. - wherein the field device electronics module comprises: -- a non-volatile data memory circuit for the persistent storage of software --- with an activated first memory area for a first program code (C 151) representing a first configuration of the field device electronics module and --- with a deactivated second memory area for a second program code (C 152) representing a second configuration of the field device electronics module and -- a control circuit that generates a selection signal (X 14) that serves to deactivate the first memory area and activate the second memory area; -- a non-volatile data memory circuit for the persistent storage of software --- with an activated first memory area for a first program code (C 151) representing a first configuration of the field device electronics module and --- with a deactivated second memory area for a second program code (C 152) representing a second configuration of the field device electronics module and -- a control circuit that generates a selection signal (X 14) that serves to deactivate the first memory area and activate the second memory area; - and wherein the measured value sensor is a Coriolis mass flow sensor or an electromagnetic volume flow sensor or a pressure transmitter or a pH electrode arrangement or a temperature sensor or a level sensor, wherein said procedure comprises the following steps (100, 200, 401,201, 203, 500): - a first program code (C 151) stored in an activated first memory area of the data memory circuit and representing a first configuration of the field device electronics module is executed by a computing process, - a first configuration process is started and registered in a coordination process, - the coordination process exclusively grants the first configuration process data write-access to a second memory area of the data memory circuit, - the first configuration process transmits modification data to the second memory area, said data being used to create a second program code (C 152) that represents a second configuration of the field device electronics module, and - the coordination process deactivates the first memory area and activates the second memory area.