Input/output device for an apparatus of the programmable auto-control type, a range of such devices
US4692842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1984 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Dec 6, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K7/1468
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An input card (7) is put in communication with apparatuses (16) the operation of which is to be monitored in order to initiate certain operations. A terminal-box (13) is interposed between the card (7), which possesses detector circuits (17), and the members (16). The two ends of each circuit (17) are associated with a respective inner terminal (12) of the terminal-box (13), and the two ends of each member (16) are associated with a respective outer terminal (14) of the terminal-box (13). Shunts (19,21) mounted in the terminal-box and connected to supply terminals (14a,14b) put one of the ends of each circuit (17) or member (16) at a common potential. The other terminal of each member (16) is connected to the other terminal of a circuit (17) by means of a connection (18). The invention is used to avoid the need for auxiliary terminal-boxes and cards with a common potential point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.