Communications network for programmable controllers
US4477882A · kind A · utility
35Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1982 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Feb 24, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B19/052
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Programmable controllers are connected in a ring by serial data links. Each controller periodically transmits information packets on the ring which contain its I/O image table data. All controllers on the ring receive such data and store it in their data tables, and such data is thus available for examination by each controller processor during its execution of the user's control program.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.