Safety controller and safety control method in which time partitions are scheduled according to a scheduling pattern
US8756606B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2011 |
| Grant date | Jun 17, 2014 |
| Priority date | — |
| Expiry date | Jan 31, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/34383
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Upon occurrence of an abnormality, a safety control can be executed more rapidly. An OS partially includes a partition scheduler that selects and decides a time partition to be subsequently scheduled according to a scheduling pattern including TP1 in which an execution time is allocated to a safety monitoring program, TP2 in which the execution time is allocated to a normal control program, and TP3 in which the execution time is allocated to a safety control program. A processor executes the OS to cause the partition scheduler to periodically operate. The partition scheduler is activated upon detection of an abnormality by one of the safety monitoring program executed in TP1 and the normal control program executed in TP2, and switches the time partition from TP1 or TP2 to TP3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.