Distributed industrial control system with remote stations taking turns supervising communications link between the remote stations
US4410983A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Jun 26, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2205
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A control system for controlling an industrial process includes a plurality of remotely located process control units (remotes) each coupled to an associated input/output device(s) and adapted to communicate with one another through a dual channel communications link. Each remote has a unique succession number within a predetermined succession order with supervisory communication-control of the communication link sequentially transferred to each remote according to its succession number to provide a revolving or master for the moment control of the system. Each remote after completing its turn as master transmits a control block to the next remote in the sequence. Each remote, when exercising supervisory communication control of the communication link, may transmit data in block form to other remotes and request and receive data back from other remotes. Each remote upon completing its turn transmits a control block to the next remote in the sequence, which, upon receiving the control block, tests for validity and, if valid, transmits an acknowledgement signal to the remote which transmitted the control block. The next remote then takes its turn exercising supervisory control over t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.