Two-wire process control loop diagnostics

Details Two-wire process control loop diagnostics Two-wire process control loop diagnostics

2008-01-22

2008-01-22

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C703S007000

Reexamination Certificate

active

11543349

ABSTRACT:
A diagnostic device for coupling to a process control loop includes digital communication circuitry configured to receive a digital communication signal from the process control loop. The digital communication signal is a digitally modulated analog signal on the process control loop which is modulated to a plurality of discrete analog signal levels representative of digital values. Diagnostic circuitry diagnoses operation of the process control loop which may include field devices of the process control loop based upon the digitally modulated analog signal.

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