Source: http://www.google.com/patents/US7321846?dq=6356708
Timestamp: 2017-09-23 20:16:00
Document Index: 351778355

Matched Legal Cases: ['art 2', 'art 3', 'art 3', 'art 2', 'art 2', 'art 4', 'art 4']

Patent US7321846 - Two-wire process control loop diagnostics - Google Patents
A diagnostic device for coupling to a process control loop includes digital communication circuitry configured to receive a digital communication signal from the process control loop. The digital communication signal is a digitally modulated analog signal on the process control loop which is modulated...http://www.google.com/patents/US7321846?utm_source=gb-gplus-sharePatent US7321846 - Two-wire process control loop diagnostics
Publication number US7321846 B1
Application number US 11/543,349
Also published as CN101523318A, CN104618079A, EP2067088A2, EP2067088B1, WO2008045258A2, WO2008045258A3, WO2008045258B1
Publication number 11543349, 543349, US 7321846 B1, US 7321846B1, US-B1-7321846, US7321846 B1, US7321846B1
Inventors Garrie D. Huisenga, Randy J. Longsdorf, Donald R. Lattimer
Patent Citations (101), Non-Patent Citations (99), Referenced by (26), Classifications (6), Legal Events (5)
US 7321846 B1
A diagnostic device for coupling to a process control loop includes digital communication circuitry configured to receive a digital communication signal from the process control loop. The digital communication signal is a digitally modulated analog signal on the process control loop which is modulated to a plurality of discrete analog signal levels representative of digital values. Diagnostic circuitry diagnoses operation of the process control loop which may include field devices of the process control loop based upon the digitally modulated analog signal.
The present invention relates to industrial process control and monitoring systems. More specifically, the present invention relates to diagnostics of industrial process control and monitoring systems which utilize two-wire process control loops to transmit information.
Various protocols have been used to communicate on two-wire process control loops. One protocol uses a 4-20 mA signal to carry information on the loop. The 4 mA signal can represent a zero or low value of a process variable while the 20 mA signal can represent a high or full scale value. The current can be controlled by a process variable transmitter to values between 4 and 20 mA to represent intermediate values of the process variable. A more complex communication technique is the HART® communication protocol in which digital information is superimposed onto a 4-20 mA signal. Typically, in such configurations a separate two-wire process control loop is required for each field device.
A more complex communication technique used on two-wire process control loops is generally referred to as fieldbus-based protocols, such as Foundation™ fieldbus. In a Fieldbus protocol, all information is transmitted digitally and the analog current level on the process control loop is not required to carry information. One advantage of such a configuration is that multiple process variable transmitters or controllers can be coupled in series on a single process control loop. Each device on the loop has an address such that it can identify messages which are addressed to it. Similarly, messages transmitted by a field device can include the address of the device so that the sender can be identified.
A diagnostic device for coupling to a process control loop includes digital communication circuitry configured to receive a digital communication signal from the process control loop. The digital communication signal is a digitally modulated analog signal on the process control loop which is modulated to a plurality of discrete analog signal levels representative of digital values. Diagnostic circuitry diagnoses operation of the process control loop based upon the digitally modulated analog signal.
The present invention is directed to diagnostics in a process control loop including diagnostics of the wiring used in a two-wire process control loop itself, as well as other devices connected to the process control loop. In particular, the present invention provides diagnostics including detection of a failed or potentially failing component in a two-wire process control loop operating in accordance with a fieldbus based protocol in which multiple devices can be connected to a single two-wire process control loop.
FIG. 1 is a simplified diagram showing a process control or monitoring system 10 including field devices 12 and 14 coupled to process piping 16. Devices 12 and 14 are coupled to a single two-wire process control loop 18 which in turn couples to a control room 20. FIG. 1 also illustrates a two-wire process control loop diagnostic device 22 coupled to loop 18. The loop 18 carries a current I which can be used to provide power to all of the field devices on loop 18 and can be generated at control room 20. Information is transmitted digitally on loop 18 by modulating a digital signal on top of the loop current I. For example, devices 12 and 14 can include unique addresses such that they are able to uniquely identify messages which they transmit, as well as identify which received messages are addressed to them. Devices 12 and 14 can comprise any type of field device including process variable transmitters and controllers. The process control loop 18 terminates at a segment terminator 24. The term “segment” refers to a portion of or all of two-wire process control loop 18.
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U.S. Classification 702/183, 702/188
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HUISENGA, GARRIE D.;LONGSDORF, RANDY J.;LATTIMER, DONALDR.;REEL/FRAME:018389/0109
May 31, 2011 RR Request for reexamination filed
Jun 5, 2012 B1 Reexamination certificate first reexamination
Free format text: CLAIMS 7, 8, 22 AND 23 ARE CANCELLED. CLAIMS 1 AND 18 ARE DETERMINED TO BE PATENTABLE AS AMENDED. CLAIMS 2-6, 9-17, 19-21, 24 AND 25, DEPENDENT ON AN AMENDED CLAIM, ARE DETERMINED TO BE PATENTABLE.