Control device and distributed control system
US11977362B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2020 |
| Grant date | May 7, 2024 |
| Priority date | — |
| Expiry date | Nov 8, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/33248
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In the conventional distributed control system, since each control device updates the data area at a timing when a control packet is received, in a case where there is a difference in communication delay between the control devices or in a case where the communication delay includes jitter, it is difficult to match the contents of data in all the control devices in a case of focusing on a certain moment during system operation. Therefore, depending on the start timing of a control application, the control application operates on the basis of different data between the control devices, thus limiting control performance improvement. Accordingly, time slots on the network are allocated according to the result of a calculation unit, and a cyclic memory synchronization update unit synchronizes the timing of reflecting data in the input/output and the cyclic memory and the timing of using data of a cyclic memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.