Field device for digital process control loop diagnostics
First Claim
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1. A diagnostic field device for coupling to a two-wire process control loop of an industrial process control or monitoring system, comprising;
- power supply circuitry configured to coupled to the two-wire process control loop and provide a power output to circuitry of the diagnostic device to thereby power the diagnostic device with power received from the two-wire process control loop;
digital communication monitoring circuitry configured to receive a digital communication signal from the two-wire process control loop, the digital communication signal including loop timing data;
timing circuitry configured to provide a timing output comprising internal timing data; and
diagnostic circuitry configured to diagnose operation of the two-wire process control loop based upon the loop timing data of the digital communication signal and the internal timing data of the timing output.
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Abstract
A diagnostic field device for coupling to a two-wire process control loop of an industrial process control or monitoring system includes digital communication monitoring circuitry which is configured to couple to a two-wire process control loop. The digital communication monitoring circuitry is configured to receive a digital communication signal from the two-wire process control loop. Timing circuitry in the diagnostic field device provides a timing output. Diagnostic circuitry provides a diagnostic output based upon the digital communication signal and the timing output.
352 Citations
31 Claims
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1. A diagnostic field device for coupling to a two-wire process control loop of an industrial process control or monitoring system, comprising;
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power supply circuitry configured to coupled to the two-wire process control loop and provide a power output to circuitry of the diagnostic device to thereby power the diagnostic device with power received from the two-wire process control loop; digital communication monitoring circuitry configured to receive a digital communication signal from the two-wire process control loop, the digital communication signal including loop timing data; timing circuitry configured to provide a timing output comprising internal timing data; and diagnostic circuitry configured to diagnose operation of the two-wire process control loop based upon the loop timing data of the digital communication signal and the internal timing data of the timing output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for diagnosing operation of a two-wire process control loop of an industrial process control loop monitoring system, comprising:
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receiving power and digital communication signals from the two-wire process control loop, the digital communication signal including loop timing data; powering circuitry of a diagnostic device with power received from the two-wire process control loop; providing a timing output comprising internal timing data which is substantially independent of data received from the two-wire process control loop; and diagnosing operation of the two-wire process control loop based upon the loop timing data of the received digital communication signal and the internal timing data of the timing output. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification
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Current AssigneeRosemount Incorporated (Emerson Electric Company)
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Original AssigneeRosemount Incorporated (Emerson Electric Company)
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InventorsLattimer, Donald R., Huisenga, Garrie D., Lewis, Richard A.
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Primary Examiner(s)Bui; Bryan
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Application NumberUS11/860,780Publication NumberTime in Patent Office721 DaysField of Search702/84, 702/183, 702/186, 702/187, 702/188, 700/26, 700/28, 340/635, 340/664US Class Current702/183CPC Class CodesG05B 23/0224 Process history based detec...
