WO2008045258B1 - Two-wire process control loop diagnostics - Google Patents

Two-wire process control loop diagnostics

Info

Publication number
WO2008045258B1
WO2008045258B1 PCT/US2007/021242 US2007021242W WO2008045258B1 WO 2008045258 B1 WO2008045258 B1 WO 2008045258B1 US 2007021242 W US2007021242 W US 2007021242W WO 2008045258 B1 WO2008045258 B1 WO 2008045258B1
Authority
WO
WIPO (PCT)
Prior art keywords
process control
control loop
analog signal
wire process
digitally modulated
Prior art date
Application number
PCT/US2007/021242
Other languages
French (fr)
Other versions
WO2008045258A2 (en
WO2008045258A3 (en
Inventor
Garrie D Huisenga
Randy J Longsdorf
Donald R Lattimer
Original Assignee
Rosemount Inc
Garrie D Huisenga
Randy J Longsdorf
Donald R Lattimer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rosemount Inc, Garrie D Huisenga, Randy J Longsdorf, Donald R Lattimer filed Critical Rosemount Inc
Priority to JP2009531438A priority Critical patent/JP5068822B2/en
Priority to EP07852513.6A priority patent/EP2067088B1/en
Publication of WO2008045258A2 publication Critical patent/WO2008045258A2/en
Publication of WO2008045258A3 publication Critical patent/WO2008045258A3/en
Publication of WO2008045258B1 publication Critical patent/WO2008045258B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/245—Testing correct operation by using the properties of transmission codes

Abstract

A diagnostic device (50) for coupling to a process control loop (18) includes digital communication circuitry (52) configured to receive a digital communication signal from the process control loop (18). The digital communication signal is a digitally modulated analog signal on the process control loop (18) which is modulated to a plurality of discrete analog signal levels representative of digital values. Diagnostic circuitry (54) diagnoses operation of the process control loop (18) which may include field devices of the process control loop based upon the digitally modulated analog signal.

Claims

AMENDED CLAIMS received by the International Bureau on 05 May 200814WHAT TS CLAIMED IS:
1. A diagnostic device for coupling to a two-wire process control loop of an industrial process control or monitoring system, comprises: digital communication circuitry configured to receive a digital communication signal from the two-wire process control loop, the digital communication signal comprising a digitally modulated analog signal on the two-wire process control loop which is modulated to a plurality of discrete analog signal levels representative of digital values; and diagnostic circuitry configured to couple in series with the two- wire process control loop and diagnose opeartion of the two-wire process control loop based upon the digitally modulated analog signal.
2. The apparatus of claim 1 wherein the digital communication circuitry includes a sense resistor.
3. The apparatus of claim 1 including an analog to digital converter configured to digitize the digitally modulated analog signal.
4. The apparatus of claim 1 wherein the diagnostic circuitry monitors amplitude of me digitally modulated analog signal.
5. The apparatus of claim 1 wherein the diagnostic circuitry monitors wave shape of the digitally modulated analog signal.
6. The apparatus of claim 1 wherein the diagnostic circuitry monitors a bit error rate (BERT) of digital transmissions on the two-wire process control loop.
7. The apparatus of claim 1 wherein the diagnostic circuitry monitors impedance of the two-wire process control loop.
8. The apparatus of claim 7 wherein the impedance is monitored by receipt of a high frequency signal on the two-wire process control loop. 15
9. The apparatus of claim 1 wherein the diagnostic circuitry compares a parameter of the digitally modulated analog signal to a stored value and responsively provides a diagnostic output.
10. The apparatus of claim 1 wherein the diagnostic circuitry correlates diagnostic infoππation based upon the digitally modulated analog signal and a particular device on the two-wire process control loop which transmitted the digitally modulated analog signal.
11. The apparatus of claim 1 wherein the diagnostic circuitry performs diagnostics on a device coupled to the two-wire process control loop.
12. The apparatus of claim 1 wherein the diagnostic circuitry performs diagnostics on wiring of the two-wire process control loop.
13. The apparatus of claim 1 including a display configured to display diagnostic information.
14. The apparatus of claim 1 including a process interface for sensing or controlling a process variable of the process.
15. The apparatus of claim 1 wherein the diagnostic device is configured to mount in the field of the industry process control or monitoring system.
16. The apparatus of claim 1 wherein the digital communication circuitry and the diagnostic circuitry are powered with power received from the two-wire process control loop.
17. The apparatus of claim 1 wherein the diagnostic circuitry diagnoses operation of a process device of the two-wire process control loop.
18. A method for diagnosing a two-wire process control loop of the type used in an industrial process control or monitoring system, comprising: receiving digital communication signals from a plurality of devices coupled to the two-wire process control loop, the digital communication signals comprising a digitally modulated analog signal which is modulated to a plurality 16
of discreet analog signal levels representative of digital values; measuring a property of the digitally modulated analog signal; diagnosing operation of the two-wire process control loop based upon the measured property of the digitally modulated analog signal measured through a series connection to the two-wire process control loop; and providing an output based upon the diagnosing.
19. The method of claim 18 wherein measuring a property comprises monitoring amplitude of the digitally modulated analog signal.
20. The method of claim 18 wherein measuring a property comprises monitoring wave shape of the digitally modulated analog signal.
21. The method of claim 18 wherein measuring a property comprises monitoring a bit error rate (BERT) of digital transmissions on the two-wire process control loop.
22. The method of claim 18 wherein measuring a property comprises monitoring impedance of the two-wire process control loop.
23. The method of claim 22 wherein measuring a property comprises monitoring by receiving a high frequency signal on the two-wire process control loop.
24. The method of claim 18 including comparing a parameter of the digitally modulated analog signal to a stored value and responsively providing a diagnostic output.
25. The method of claim 18 includes correlating diagnostic information based upon the digitally modulated analog signal and a particular device on the two- wire process control loop which transmitted the signal.
PCT/US2007/021242 2006-10-05 2007-10-03 Two-wire process control loop diagnostics WO2008045258A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2009531438A JP5068822B2 (en) 2006-10-05 2007-10-03 2-wire process control loop diagnostics
EP07852513.6A EP2067088B1 (en) 2006-10-05 2007-10-03 Two-wire process control loop diagnostics

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/543,349 US7321846B1 (en) 2006-10-05 2006-10-05 Two-wire process control loop diagnostics
US11/543,349 2006-10-05

Publications (3)

Publication Number Publication Date
WO2008045258A2 WO2008045258A2 (en) 2008-04-17
WO2008045258A3 WO2008045258A3 (en) 2008-05-29
WO2008045258B1 true WO2008045258B1 (en) 2008-07-24

Family

ID=38969412

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/021242 WO2008045258A2 (en) 2006-10-05 2007-10-03 Two-wire process control loop diagnostics

Country Status (5)

Country Link
US (1) US7321846B1 (en)
EP (1) EP2067088B1 (en)
JP (1) JP5068822B2 (en)
CN (2) CN104618079B (en)
WO (1) WO2008045258A2 (en)

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Also Published As

Publication number Publication date
EP2067088A2 (en) 2009-06-10
WO2008045258A2 (en) 2008-04-17
WO2008045258A3 (en) 2008-05-29
JP2010506298A (en) 2010-02-25
CN101523318A (en) 2009-09-02
CN104618079A (en) 2015-05-13
US7321846B1 (en) 2008-01-22
CN104618079B (en) 2019-10-22
EP2067088B1 (en) 2014-07-16
JP5068822B2 (en) 2012-11-07

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