Input circuit of a field device

Details Input circuit of a field device Input circuit of a field device

1998-03-27

2000-02-15

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 112

Patent

active

060257938

ABSTRACT:
An input circuit for a field device for communication with bidirectional signals superposed on an analog signal, the input circuit being part of a current loop, supplies the field device with energy and simultaneously carries an analog current signal for prescribing a reference value. The field device is connected to an actuator that is suitable for achieving the reference value, and the input circuit has a voltage limiter, a shunt resistor and an inductance connected in series between its input and output. The input signal of an analog-to-digital converter can be taken at the shunt resistor. The voltage limiter is connected in parallel with a voltage regulator. The inductance is coupled via a capacitance to a reception unit and/or to a transmission unit for digital signals.

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Published Student Thesis Entitle "A Microprocesor Controlled Valve Positioner", Feldman, Purdue Technical Information Service, May, 1986.
"HART.RTM.--Smart Communications Protocol Specification, Revision 5.1" Feb. 8, 1990.

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