Industrial controller having redundancy and using connected messaging and connection identifiers to enable rapid switchover without requiring new connections to be opened or closed at switchover
US5963448A · kind A · utility
67Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Jun 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2023
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A redundant controller employs connection-based messaging to ensure reliability and determinacy in communications. The need to close connections and reopen connections with a backup module when control switches from a primary controller to a secondary controller is eliminated by keeping the secondary controller updated as to the connections that have been opened and having the secondary controller assume the connection identification numbers of the primary controller upon switch-over.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.