Fault processor for programmable controller with remote I/O interface racks
US3997879A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1975 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Dec 24, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/25458
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A programmable controller includes four remotely located input/output interface racks which are connected by cables to an I/O scanner circuit which is centrally located with the controller processor and memory. Input and output data is serially transmitted between the I/O scanner circuit and the interface racks, and fault processors are located in both the I/O scanner circuit and the interface racks to monitor the operation. The fault processors include fault tolerant detector circuits which ignore erroneous transmissions caused by industrial noise, but which initiate a shutdown process when malfunctions occur. The shutdown process is controlled by a programmable disabling circuit which is responsive to program instructions stored in the controller memory to allow independent, quasi-independent, or dependent operation of the machines connected to each of the four interface racks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.