Error control apparatus using restore memory for recovering from parity discordances in transmissions between controller and real-time I/O devices
US4864531A · kind A · utility
14Cited by
9References
2Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 28, 1987 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/25152
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An input/output device monitors the transmission of information between a processor of a programmable controller and sensors and actuators of a process to be controlled. This device includes electronic circuits adapted for calculating the parities of the digital words which pass therethrough, these parities being compared with corresponding parities calculated by the processor which thereafter invalidates the words having two different parities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.