Method and apparatus for protecting and monitoring the transmission of information between the central unit of a programmable controller and the sensors and/or the actuators of the controlled process
US4774656A · kind A · utility
23Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1985 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Feb 1, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/14144
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An input/output device is used for a programmable controller having on input/output cards a plurality of electronic channels forming the logic interfaces between the connection bus with the central unit and the sensors or the actuators connected to the controllers; this device further uses electronic circuits for monitoring the good transmission of input/output signals by the adaptation interfaces providing for the galvanic isolation of the bus with respect to the sensors and actuators of the controlled automatism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.