Programmable logic controller system and programmable logic controller
AssigneeMitsubishi Electric Corporation
InventorKeisuke NAKAJIMA
Life of this patent
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Abstract
In the PLC system, the setting information can be backed up by detecting the change of the setting information on a device in the PLC system, and, the system configuration information, the date and time at which the setting information was backed up, and the target device are written in the system file when the setting information is backed up and a restore can only be performed on a device on which a restore should be performed in accordance with the information stored in the system file. Therefore, it is possible to definitely perform a backup and efficiently perform backup and restore in terms of performance and memory capacity used.
Claims10
A programmable logic controller system comprising:
- devices that store setting information for controlling the devices and, when the setting information has been changed, notify another programmable logic controller that a change has occurred;
- and
- a programmable logic controller that stores the setting information on the devices in a storage unit and, when a notification indicating that the setting change has occurred is received, updates, among the setting information stored in the storage unit, setting information corresponding to a device from which the notification is received to latest setting information stored in the device.
A programmable logic controller comprising:
- a storage unit that stores setting information on devices that, when setting information for controlling the devices has been changed, notify an external source that the change has occurred;
- and
- an updating unit that, when a notification indicating that the setting change has occurred is received, updates, among the setting information stored in the storage unit, setting information corresponding to a device from which the notification is received to latest setting information stored in the device.
Dependencies are inferred from the claim text.