A programmable display device for a production system that includes a storage device and a plurality of the programmable display devices. The storage device includes a plurality of individual memory areas that store data from the plurality of the programmable display devices individually and are associated with any one of the plurality of the programmable display devices. There is a backup processing unit that loads some or all data that the programmable display device itself retains into an individual memory area associated with the programmable display device itself among the plurality of individual memory areas and a state management unit that updates state management information retained in the storage device when the backup processing unit has performed data update within the individual memory area associated with the programmable display device itself. The state management information indicates that data retained by the plurality of individual memory areas have been updated.