Multiplex Communication Disconnection for Stable Slave Control Data

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Solution Overview

Problem

In industrial networks, the delay in detecting a disconnection in the multiplex communication line can lead to the transmission of erroneous control data from a multiprocessing device to a slave, potentially causing unstable processing due to the continued transfer of control data until the disconnection is detected.

Innovation Solution

A multiplexing device with a control device that issues a disconnection command to disconnect communication between the multiprocessing device and the slave upon detection of a multiplex communication line disconnection, using a multistage slave configuration and DUMMY-PHY to manage the communication disconnection before the line is actually disconnected.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the multiprocessing device continues to transmit control data after multiplex communication line disconnection, then data transmission continuity is maintained, but erroneous control data is transmitted causing processing instability

Engineering Contradiction:

Improveprocessing stabilityVSAvoiderroneous control data transmission

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The system performs preliminary detection of multiplex communication line disconnection and issues a disconnection command to the first slave before actual data transmission occurs. This advance action prevents erroneous control data from being transmitted while maintaining system reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The multiprocessing device monitors the multiplex communication line status and provides feedback by issuing disconnection commands to the first slave when disconnection is detected. This feedback mechanism ensures that control data transmission is properly managed and erroneous data is prevented from being transmitted.

Inventive Principle:

Principle #23Feedback

2Reliability

If the multiprocessing device detects disconnection quickly, then erroneous data transmission is prevented, but detection delay occurs during maintenance

Engineering Contradiction:

Improvedisconnection detection accuracyVSAvoiddetection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system issues a disconnection command to the first slave as a preliminary action upon detecting multiplex communication line disconnection. This allows the first slave to stop receiving and processing control data immediately, preventing erroneous data transmission even if the multiprocessing device's detection is delayed during maintenance periods.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The first slave acts as an intermediary that receives the disconnection command from the multiprocessing device and independently stops control data transmission. This intermediary mechanism ensures that erroneous data transmission is prevented at the slave level, compensating for any detection delays at the multiprocessing device level.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of information

If communication is disconnected immediately upon multiplex line disconnection, then erroneous data is prevented, but communication stability is reduced due to detection delays

Engineering Contradiction:

Improveerroneous control data preventionVSAvoidcommunication stability

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The first slave serves as an intermediary that receives disconnection commands from the multiprocessing device and executes the communication shutdown. This intermediary approach allows the multiprocessing device to maintain communication stability while the first slave prevents erroneous data transmission by stopping reception and processing of control data.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system establishes a feedback loop where the multiprocessing device monitors multiplex communication line status and sends disconnection commands to the first slave. This feedback mechanism ensures that communication is disconnected properly when needed while maintaining stability during normal operation, preventing both erroneous data transmission and unnecessary communication disruptions.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP3742676B1Multiplexing device, working machine, and communication disconnection method

Publication Date: 2022.01.26 FUJI CORP

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AI summary

There are provided a multiplexing device configured to disconnect properly a communication between a multiprocessing device and a slave in response to a disconnection of a multiplex communication line, a working machine including the multiplexing device, and a communication disconnection method. The multiplexing device includes a multistage slave configured to process control data transmitted from a master in an industrial network, a multiprocessing device configured to multiplex the control data transmitted from a first slave of the multistage slave, the first slave being disposed at an upstream side to the master of the multistage slave, and transmit the control data so multiplexed to a second slave of the multistage slave by way of a multiplex communication line, the second slave being situated at a downstream side of the multistage slave, and a control device configured to issue a disconnection command to disconnect a communication between the first slave and the multiprocessing device in response to a disconnection of the multiplex communication line.