A valve assembly , comprising: a valve comprising a plug and a seat , wherein the plug is moveable relative to the seat; an actuator coupled with the valve using a valve stem interposed therebetween; a first circuit board configured to store data; a valve positioner , wherein the actuator is coupled to the valve positioner and wherein the valve positioner is configured to secure the first circuit board; characterized in that the valve positioner is further configured to secure a second circuit board , wherein the second circuit board is configured with data that is different from data of the first circuit board; wherein the first circuit board includes a microprocessor , and wherein the second circuit board, when a power signal is removed from the valve positioner and the position of the plug relative to the seat is mechanically locked, is replaceably couplable in communication with the first circuit board and arranged to expand the functions of the first circuit board ; wherein, when the second circuit board is secured by the valve positioner and coupled to the first circuit board, the microprocessor is configured to carry out the following: communicate with the second circuit board coupled with the first circuit board ; validate operation of the second circuit board as part of a circuit board assembly; find a storage memory on the second circuit board ; retrieve data from the storage memory ; and use the data to configure functions on the first circuit board to facilitate a variety of operative functions to the actuator . a valve comprising a plug and a seat , wherein the plug is moveable relative to the seat; an actuator coupled with the valve using a valve stem interposed therebetween; a first circuit board configured to store data; a valve positioner , wherein the actuator is coupled to the valve positioner and wherein the valve positioner is configured to secure the first circuit board; characterized in that the valve positioner is further configured to secure a second circuit board , wherein the second circuit board is configured with data that is different from data of the first circuit board; wherein the first circuit board includes a microprocessor , and wherein the second circuit board, when a power signal is removed from the valve positioner and the position of the plug relative to the seat is mechanically locked, is replaceably couplable in communication with the first circuit board and arranged to expand the functions of the first circuit board ; wherein, when the second circuit board is secured by the valve positioner and coupled to the first circuit board, the microprocessor is configured to carry out the following: communicate with the second circuit board coupled with the first circuit board ; validate operation of the second circuit board as part of a circuit board assembly; find a storage memory on the second circuit board ; retrieve data from the storage memory ; and use the data to configure functions on the first circuit board to facilitate a variety of operative functions to the actuator . communicate with the second circuit board coupled with the first circuit board ; validate operation of the second circuit board as part of a circuit board assembly; find a storage memory on the second circuit board ; retrieve data from the storage memory ; and use the data to configure functions on the first circuit board to facilitate a variety of operative functions to the actuator . <EOS>