Slave Log Storage Switching During Industrial Network Faults
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Solution Overview
Problem
In industrial networks, communication abnormalities between a master and a slave can lead to the loss of log information stored in volatile storage, making it difficult to diagnose the cause of the abnormality, especially when power is interrupted.
Innovation Solution
A slave device with both volatile and non-volatile storage sections, where log information is initially stored in volatile memory during normal operation and then transferred to non-volatile memory upon detection of a communication abnormality, ensuring persistence even if power is lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If log information is stored in volatile storage section, then storage speed and accessibility are improved, but data loss occurs when power is interrupted or communication abnormality occurs
Solution Approach 1:
The storage system is segmented into two distinct parts: volatile storage section for high-speed temporary storage and non-volatile storage section for reliable data persistence. The control section manages data flow between these segments, copying log information from volatile to non-volatile storage when communication abnormalities are detected, thus resolving the contradiction between speed and reliability.
2Reliability
If log information is stored in non-volatile storage section, then data persistence is improved, but storage speed and accessibility deteriorate
Solution Approach 1:
Log information is preliminarily stored in the volatile storage section during normal operation, where it can be quickly written and accessed. The non-volatile storage section serves as a backup that is activated only when necessary (upon detecting communication abnormalities), thus maintaining high storage speed during normal operations while ensuring data persistence when needed.
3Reliability
If communication abnormality detection and log transfer processing are added, then data persistence during abnormalities is improved, but device complexity increases
Solution Approach 1:
The control section implements a feedback mechanism that continuously monitors communication status between the master and slave devices. When a communication abnormality is detected, the system automatically triggers the log transfer process from volatile to non-volatile storage. This feedback-based approach adds minimal complexity while significantly improving reliability during abnormal conditions.
Data Source
AI summary
There are provided a slave, a work machine, and a method for storing log information, which are capable of appropriately store the log information when a communication abnormality occurs such that communication cannot be kept between a master and the slave in an industrial network. The control section performs first storage processing storing the log information into a volatile storage section when a communication abnormality occurs such that communication with the master cannot be kept, communication abnormality determination processing for determining whether the communication abnormality has occurred, and second storage processing storing the log information into a non-volatile storage section by acquiring the log information from the volatile storage section, in response to a determination made in that the communication abnormality has occurred as a result of the communication abnormality determination processing.