Sequence control apparatus
US4748553A · kind A · utility
8Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Feb 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B19/058
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The states of the signals inputted to a programmable sequence controller or outputted from the programmable sequence controller are stored by a few scanning operations. A check is made to see if a combination of input and output signals which cannot be generated during one scanning operation in the normal operating mode exists in that memory content or not, thereby investigating causes of the occurrence of abnormalities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.