Communications: electrical – Continuously variable indicating – Plural transmitters
Patent
1997-07-21
1999-10-05
Horabik, Michael
Communications: electrical
Continuously variable indicating
Plural transmitters
34087016, G08C 1904
Patent
active
059631473
ABSTRACT:
Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.
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Anderson Stephen D.
Brown Gregory C.
Louwagie Bennett L.
Piechowski Todd A.
Westfield Brian L.
Edwards, Jr. Timothy
Horabik Michael
Rosemont Inc.
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