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TWO-WIRE PROCESS CONTROL LOOP CURRENT DIAGNOSTICS

  • US 20130046490A1
  • Filed: 08/16/2011
  • Published: 02/21/2013
  • Est. Priority Date: 08/16/2011
  • Status: Active Grant
First Claim
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1. A process variable transmitter, comprising:

  • a processor receiving an input signal indicative of a sensed process variable and outputting a digital signal indicative of the input signal;

    a digital-to-analog (D/A) converter receiving the digital signal and converting it to an analog signal;

    a loop control component receiving the analog signal and controlling a two-wire process control loop to provide a transmitter output signal indicative of the analog signal, the transmitter output signal varying, on-scale, between a first signal level and a second signal level; and

    a loop diagnostic component, comparing a first signal value indicative of the analog signal with a second signal value indicative of the transmitter output signal to determine whether the transmitter output signal includes an on-scale error and responsively outputting an error indicator to the processor.

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