Programmable controller with data archive
US4291388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1978 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Dec 20, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/11101
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A programmable controller interfaces a numerical control system to sensing and operating devices that control the auxiliary functions on a machine tool. In the controller a microprocessor is coupled to a random-access memory (RAM) and an electrically alterable read-only memory (EAROM) through an address bus and a data bus. The RAM stores a user control program and an I/O image table that depicts the status of the sensing and operating devices on the machine tool. Under program control the microprocessor verifies the contents of the RAM and copies the verified contents into the EAROM. If the contents of the RAM are altered or lost, the master copy of data stored in the EAROM is reloaded into the RAM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.