Process device with diagnostic annunciation
AssigneeRosemount Inc.
InventorsRandy Longsdorf, Dale Davis
Life of this patent
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Abstract
A process device for coupling to a two-wire process control loop includes diagnostic circuitry configured to identify a failure or reduced level of performance or provide a prediction of a future failure or reduced level of performance. An output coupled to the two-wire process control loop is configured to provide an analog output on the loop related to an output from the diagnostic circuitry. A method is also provided.
Claims58
A process device for coupling to a two-wire process control loop comprising:
- diagnostic circuitry configured to diagnose operation of the process device or the process;
- an output configured to couple to the two-wire process control loop configured to provide an analog current output on the loop indicative of more than two diagnostic conditions.
A process device for coupling to a two-wire process control loop comprising:
- diagnostic circuitry configured to diagnose operation of the process device or process;
- an output configured to couple to the two-wire process control loop configured to provide an analog current output on the loop indicative of a diagnostic condition and having a value of between 4 milliAmps and 20 milliAmps.
A process device for coupling to a two-wire process control loop comprising:
- diagnostic circuitry configured to diagnose operation of the process device or the process;
- an output configured to couple to the two-wire process control loop configured to provide an analog current output on the loop indicative of predictive diagnostic information.
Interface circuitry for use in diagnostics of an industrial process, comprising:
- a first loop connection configured to couple to a first two wire process control loop which couples to a process device, the first two wire process control loop configured to carry information related to a diagnostic condition and to a process variable;
- a second loop connection configured to couple to a second process control loop, wherein the interface circuitry controls a current level in the second process control loop as a function of the process variable;
- and
- a third loop connection configured to couple to a third process control loop, wherein the interface circuitry controls a current level in the third process control loop as a function of the diagnostic condition.
A method of annunciating diagnostic information related to a process device or a process coupled to a two-wire process control looping comprising:
- diagnosing operation of the process device or the process;
- outputting an analog current level on the two-wire process control loop indicative of more than two diagnostic conditions.
A method of annunciating diagnostic information related to a process or a process device coupled to a two-wire process control loop comprising:
- diagnosing operation of the process device or the process;
- outputting an analog current level on the two-wire process control loop indicative of a diagnostic condition and having a value of between 4 milliAmps and 20 milliAmps.
A method of annunciating diagnostic information related to a process or a process device coupled to a two-wire process control loop comprising:
- diagnosing operation of the process device or the process;
- outputting an analog current level on the two-wire process control loop indicative of predictive diagnostic information.
Dependencies are inferred from the claim text.