Cable Fault Assessment Using Reflection Waves and Link-Up Status
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Solution Overview
Problem
In industrial networks, detecting cable abnormalities such as disconnections or short circuits is challenging due to the difficulty in stopping the system for diagnosis, and existing methods cannot determine if communication disruptions are caused by cable failures or not, nor locate the fault.
Innovation Solution
A cable abnormality assessment system with a communication unit in a slave device that performs signal line diagnosis by transmitting pulses and detecting reflection waves, using link-up information and diagnosis results from both pair signal lines to assess cable abnormalities without requiring the other machine to be offline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system is stopped for cable diagnosis using reflection wave detection, then accurate cable abnormality detection is achieved, but industrial network operation is disrupted
Solution Approach 1:
The patent applies preliminary action by performing cable diagnosis during network initialization or reconfiguration phases before normal operation begins. The master device sends diagnostic signals to detect cable abnormalities, and only after diagnosis is complete does the system transition to normal operational mode, ensuring accurate detection without disrupting ongoing production.
Solution Approach 2:
The system implements periodic action by scheduling cable diagnosis operations at predetermined intervals or triggered by specific events such as link-up changes. The master device periodically sends diagnostic signals through the network to assess cable status, allowing continuous monitoring while maintaining normal operations between diagnostic cycles.
2Loss of information
If cable diagnosis is performed using existing link-off information, then communication disruption detection is achieved, but cable failure location and cause cannot be determined
Solution Approach 1:
The patent introduces an intermediary diagnostic signal (reflection wave detection signal) that acts as a mediator between the master device and slave devices. This special diagnostic signal enables the master device to not only detect communication disruptions but also to determine the location and cause of cable failures by analyzing reflected waves, providing precise fault information without interrupting normal communication operations.
Solution Approach 2:
The system applies segmentation by dividing the cable network into individual segments between the master device and each slave device. By sending diagnostic signals through each segment and analyzing reflection patterns, the system can pinpoint the exact location of cable failures within specific segments, transforming a binary link-up/down status into detailed spatial fault information.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate detection of cable abnormalities within the network regardless of the operating status of the connected machine, allowing for precise identification of fault locations without disrupting the industrial network's operation.
Implementation Method 1
transmitting a pulse to a pair signal line of a cable connected and detecting a reflection wave
Data Source
AI summary
The invention provides a cable abnormality assessment system, a slave device, and a cable abnormality assessment method. A cable abnormality assessment system is provided with a diagnosis control unit for assessing a cable abnormality on the basis of link-up information between a communication unit and another machine connected to the other end of a cable, and first and second information that are the respective results of abnormality diagnosis by a signal line diagnosis unit with regard to one and the other of two pair signal lines of the cable.