Analog interface circuits for process controllers and process mo

Details Analog interface circuits for process controllers and process mo Analog interface circuits for process controllers and process mo

1996-06-21

1998-09-08

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 166

Patent

active

058050949

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.

REFERENCES:
patent: 5038365 (1991-08-01), Belloc et al.
patent: 5170387 (1992-12-01), Groen

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