Efficient computer input system for sensing status of high voltage contacts
US4470041A · kind A · utility
9Cited by
3References
9Claims
0Family size
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Key dates
| Filing date | Nov 4, 1981 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Nov 4, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/67
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus is provided for sensing the state of high voltage contact inputs in a process control system. Lower voltage contact closure input modules cooperate with a reference bus and reference bus regulator to reduce the voltage drop across an input module when a pair of contacts is closed, thereby reducing the energy dissipated and heat created by the input module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.