| 摘要 |
<p>PROBLEM TO BE SOLVED: To recover a system on early stage in the case where any problem occurs after the setting of the system is changed.SOLUTION: A plurality of node devices 2 are provided to form the system. The node device 2 is shifted to an offline state when changing setting information via an engineering device. The node device 2 includes: setting information preservation means 22 for preserving present setting information in a save area when shifting to the offline state; and recovery means 24 for resetting the setting information that has been preserved by the setting information preservation means 22, as setting information of the node device in response to an instruction from the outside.</p> |
