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Detecting and locating process control communication line faults from a handheld maintenance tool

A communication line and detection process technology, applied in the direction of program control, comprehensive factory control, test/monitoring control system, etc., can solve the problem that the line is difficult to see

Active Publication Date: 2017-09-12
FISHER-ROSEMOUNT SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, the communication and power lines of the process control communication bus can span great distances within the plant and, as installed in the plant, these lines may be hidden, covered, or otherwise difficult to see
Therefore, even if the operator knows that there is a fault in the line, it may take a long time to visually inspect the line to find the fault

Method used

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  • Detecting and locating process control communication line faults from a handheld maintenance tool
  • Detecting and locating process control communication line faults from a handheld maintenance tool
  • Detecting and locating process control communication line faults from a handheld maintenance tool

Examples

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Embodiment Construction

[0032] Apparatus and methods as described herein generally enable detection of faults within a communication network, such as a process control communication network, including, for example, short circuit (low impedance) faults and open circuit (high impedance) faults. More specifically, in one example, a handheld device and method using a portable or handheld device is connected to a field device within a network, such as a hardwired communication network, and communicates over, for example, a two-wire conductor set or a two-wire Provides power and / or communication signals on communication lines, while in some cases also conforming to intrinsically safe ("IS") standards, in order to perform protocol communications with and about devices on the communication network diagnosis or other operations. Hand-held devices and methods of using the same provide many safety features and advantages over current systems of communicating with and supplying power to field devices, so a brief...

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PUM

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Abstract

A handheld maintenance tool operates to detect the existence of a fault in a communication line or bus, including detecting short circuit or other low impedance faults, open circuit or other high impedance faults, etc. Additionally, the handheld maintenance tool may operate to detect an approximate location of a fault within the communication line with respect to the handheld device, to thereby enable an operator or maintenance person to more easily find and repair a detected fault.

Description

technical field [0001] This application relates to a diagnostic hand-held maintenance tool that selectively provides power and communication signals to one or more field devices on a communication line, and more particularly, to a hand-held tool capable of detecting and locating faults in a communication line maintenance tool. Background technique [0002] Process control systems, such as those used in chemical and petroleum processes, typically include one or more process controllers communicatively coupled to at least one host computer or operator workstation and controlled via analog, digital, or a combination of analog The / digital bus is communicatively coupled to one or more field devices. Field devices, which can be, for example, valves, valve positioners, switches, and transmitters (eg, temperature, pressure, and flow rate sensors) perform functions (such as opening or closing valves and measuring process parameters) within a process plant. Process controllers Rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/11
CPCG01R31/11H04L41/0677H04L43/50G05B19/0423G05B2219/33228G01R31/08G05B23/0256H04L43/0823
Inventor M·R·达拉尔
Owner FISHER-ROSEMOUNT SYST INC