Patent ID: 7299348

Claim:
Field device electronics of a programmable field mounted device, comprising: a memory circuit with a plurality of memory areas for storing program codes; and a control circuit with a microprocessor, said microprocessor having read access to memory areas being activated during on-line operation of the field mounted device, wherein: at least a first memory area of said plurality of memory areas is selectively activated, and at least a second memory area of said plurality of memory areas is selectively deactivated, said first memory area containing a first program code, said second memory area containing a second program code; said control circuit is configured to generate a selection signal during on-line operation of the field mounted device, said selection signal activating said second memory area to create an activated memory area containing the second program code, and said selection signal deactivating said first memory area to create a deactivated memory area for storing the first program code; and the field device electronics is connected with a sensor generating a sensor signal representative of a process variable, said process variable being selected from a group of process variables consisting of tank contents level, volumetric flow rate of a moving fluid, mass flow rate of a moving fluid, pressure, pH value of a medium, and temperature of a medium, wherein: the program codes are selected from a group of program codes representing calibration data for the field mounted device, routines for implementing communication interfaces, routines for driving peripheral indicating, routines for driving peripheral control elements, and signal processing routines for generating the measurement signal.