Analog interface circuits for process controllers and process monitors
US5805094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Jun 21, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/05
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interface circuit for use with process controllers permits analog signals to be input to a process controller through a binary interface of the process controller and permits analog signals to be output from the process controller through the binary interface. The input analog signal is converted to a digital word of N bits. An identification or end indication and the N bits of the digital word are transmitted to the process controller at a rate selected for compatibility with the scan time of the process controller. The process controller includes a software routine for recognizing the N bits of the digital word. An equivalent approach is used for outputting analog signals through a binary interface of a process controller. The interface circuit can include multiple channels for inputting or outputting multiple analog signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.