Two-wire process control loop diagnostic

  title={Two-wire process control loop diagnostic},
  author={ホイシンガ,ギャリー・ディー and ラッティマー,ドナルド・アール and ロングスドーフ,ランディ・ジェイ},
Diagnostic apparatus for coupling to a process control loop (18) (50) includes a configured digital communication circuit (52) to receive a digital communication signal from the process control loop (18). Digital communication signal is a digitally modulated analog signal on process control loop (18), are modulated into a plurality of discrete analog signal levels representing digital values. Diagnostic circuitry (54), based on the digitally modulated analog signal, to diagnose operation of the… CONTINUE READING

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