Safety controller and safety control method
US9373253B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2014 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Aug 21, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/34382
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A safety controller includes a first interrupt signal output unit outputting a first interrupt signal in a cycle synchronous with that of a first carrier signal defining a control cycle of a control target; a second interrupt signal output unit outputting a second interrupt signal in a cycle synchronous with that of a second carrier signal defining a control cycle of the control target, the first and second carrier signals having the same cycle and a predetermined phase difference; and a control unit executing tasks and controlling the control target by switching and scheduling time partitions according to outputs of the first and second interrupt signals from the first and second interrupt signal output units. The control unit stops controlling the control target upon detecting, as an abnormality related to the first and second interrupt signals, that the first and second interrupt signals are not output in a predetermined order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.