Control logic safety monitoring circuit means
US4558389A · kind A · utility
6Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1980 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Jan 14, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B23/0286
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A microcomputer utilizing a crystal controlled clock and a power line responsive clock operates both the control system and into a safety timing means. The safety timing means can take the form of a pair of retriggerable monostable multivibrators that are operated to monitor the microcomputer along with a feedback circuit from a load control means. The feedback from the load control means senses the status of a safety switch means and provides the microcomputer with the ability to monitor and be monitored for safe operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.