Patent ID: 8521308

Claim:
A supervisory control system comprising: a supervisory control target device for which attributes to be subjected to supervisory control are defined in association with an existing function of the supervisory control target device; and a supervisory control device by which the attributes of the supervisory control target device that are to be subjected to supervisory control are retained as attributes of an instance associated with the supervisory control target device; wherein: the supervisory control device is configured such that when a function is added to the supervisory control target device, an attribute usage flag that indicates whether the supervisory control device supports any changes in the attributes due to adding of the function, and an attribute effectiveness flag which, as information to which is assigned a value read out from the supervisory control target device, indicates whether the supervisory control target device supports the changes, are added, as information concerning the attributes that undergo the changes, to a definition of the instance which the supervisory control device retains; and the supervisory control device includes a control unit implemented at least by a hardware including a processor and which, on a basis of data of the attribute usage flag and attribute effectiveness flag relating to the attributes undergoing the changes due to the addition of the function, determines at least one of whether the supervisory control target device supports a new function and whether supervisory control based upon the new function is effective for the attributes undergoing the changes due to the addition of the function.