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System and method for associating a DLPDU received by an interface chip with a data measurement made by an external circuit

An associative and data technology, applied in electrical digital data processing, test/monitoring control system, input/output process of data processing, etc., can solve the problem that system-level users cannot easily identify, difficult to configure error troubleshooting, no Problems such as correct operation

Active Publication Date: 2008-02-13
FISHER-ROSEMOUNT SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] With current diagnostic devices and methods, it is difficult to troubleshoot communication problems and configuration errors associated with field devices on the protocol bus
As a result, system-level users cannot easily identify the cause of the problem, and are typically only informed by the system that the overall process is not operating correctly
When this alarm occurs, it is difficult to identify and determine the faulty field device

Method used

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  • System and method for associating a DLPDU received by an interface chip with a data measurement made by an external circuit
  • System and method for associating a DLPDU received by an interface chip with a data measurement made by an external circuit
  • System and method for associating a DLPDU received by an interface chip with a data measurement made by an external circuit

Examples

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Embodiment Construction

[0021] FIG. 1 shows an industrial control system 10 having a control center 12 connected by local loop cabling 14 to a plurality of field devices 16 to form a control network 18 . Diagnostic tool 20 is connected to network 18 . The local loop cabling 14 is extended along dashed lines and additional field devices 16 are also shown in dashed lines to show that the local loop cabling 14 can be extended and the network 18 can be expanded by adding field devices 16 if required.

[0022] Typically, the local return cabling 14 in a conventional fieldbus network may be a two-wire, three-wire or four-wire twisted-pair cable. In a typical plant, the local loop cabling 14 can extend several kilometers and multiple field devices 16 can be connected via the cabling 14 to the control center 12 (via connectors, direct wiring, or junction boxes), making the network 18 very complex. Big.

[0023] As indicated above, the diagnostic tool 20 is connected to the local loop cabling 14 to utilize ...

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Abstract

A diagnostic tool (20) has a packet based network medium attachment unit (22), a measurement interface (26), a network interface (28), and a microprocessor (30) for reading DLPDUs from a network segment and for taking simultaneous measurements of DLPDUs on the segment. The measurement data is associated with a stored DLPDU if the DLPDU is still active on the network segment when the measurement data is read by the microprocessor (30). The diagnostic tool (20) utilizes a currently active attribute to determine the status of a DLPDU.

Description

technical field [0001] The present invention generally relates to a diagnostic device for use with a process control system. More specifically, the present invention relates to a hand-held diagnostic device for interacting with a packet-based network, such as a Fieldbus, in a process control system, and with a communication system for field devices linked to the network, whereby the Communication packets are associated with specific field devices for the purpose of diagnosing problems on the network. Background technique [0002] In industrial environments, control systems monitor and control inventories, industrial and chemical processes, etc. Typically, the control system performs these functions using field devices that are distributed at key locations in the industrial process and are connected through the process control loop to the control circuits in the control room. The term "field device" refers to any device that performs a function in a distributed control syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/00G05B9/02G05B23/02G06F3/00G06F9/44G06F9/46G06F13/00G06K5/04G11B5/00G11B20/20H04L69/40
CPCG05B23/0229
Inventor 布赖恩·A·弗兰丘克罗格·R·本森
Owner FISHER-ROSEMOUNT SYST INC
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