Analog interface circuits for process controllers and process monitors
US5416480A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1994 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Apr 8, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/21008
- WIPO fieldControl
- WIPO sectorInstruments
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 sample of N bits. An identification pulse and the N bits of the digital sample 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 identification pulse and the N bits of the digital sample. 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.