Supervisory control system
US6763381B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2000 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Feb 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/329
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A supervisory control system which can quickly and accurately transmit supervisory control information of a supervised apparatus is provided. This supervisory control apparatus includes a cache storage unit which caches response information to be sent as cache information to a supervisory control terminal, and a cache management unit which manages cumulated cache information. The cache management unit caches the response information of a supervised apparatus designated by a supervisory control request from the supervisory control terminal. When the response information corresponding to the supervisory control request from the supervisory control terminal exists as cache information in the cache storage unit, the cache management unit transmits the cache information to the supervisory control terminal. When the response information does not exist in the cache storage unit, the cache management unit issues a supervisory control instruction to obtain response information to the designated supervised apparatus, and transmits the newly obtained response information to the supervisory control terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.