Multiplex communication system for sequence controllers
US4881220A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 24, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Aug 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/437
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Among systems configured by connecting a plurality of sequence controllers to one communication line to intercommunicate, many systems has been disclosed which implement fault location and recovery from the faults. In one of these systems, each substation is connected to a circulating communication line via a branch line and switches are respectively disposed on the branch line and on the communication line at both sides of a connecting point of the branch line and the communication line. Further, the communication line can be formed in a loop by a spare line. In another of these systems, an integrated portion of the communication line is formed near the master station, and the communication line is connected to the master station and is configured of one continuous line which goes and backs in sequence between the integrated portion and vicinity of each substation. In that integrated portion, a switch is disposed on each one of two lines, which connect the integrated portion and each substation. Further, a switch is provided on a line which bypasses these two switches. Other systems are a composite of the above systems. Still other systems have automated portions of fault location…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.