Patent ID: 8707423

Claim:
A programmable display device that is connected to Programmable Logic Controller (PLC) control devices that store setting information for performing a predetermined control process and perform the control process based on the setting information, and perform a backup or restore process of the setting information, the programmable display device comprising: a communication process unit that accesses the PLC control devices executing sequence programs; a file system process unit that accesses a storage medium that stores therein first information including target control device information for one of the PLC control devices and target setting information and is built in or detachable from the programmable display device, the target control device information specifying a PLC control device selected from the PLC control devices that is to be a target for the backup or restore process out of the PLC control devices connected to the programmable display device, the target setting information specifying setting information that is to be a target for the backup or restore process out of a plurality of pieces of setting information stored in the PLC control device specified in the target control device information; a setting information obtaining/writing process unit that accesses the PLC control device via the communication process unit based on the first information in the storage medium in accordance with a request for performing the backup or restore process from outside, and performs the backup or restore process of the setting information by accessing the storage medium via the file system process unit; wherein the storage medium stores therein a whole password, an individual password, and second information in which access to setting information of target PLC control devices specified in the first information is limited by the whole password, and the second information includes setting information of each of the PLC control devices to which access is limited by the individual password, and wherein the setting information of the target PLC control devices are protected by a respective individual password and wherein the whole password authorizes the backup or restore of each of the target PLC control devices.