PLC Data Log Module Tri-Fold Backup for External Storage Failure
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Solution Overview
Problem
Existing PLC data log modules cannot store data reliably when CF or USB memory is removed, and they can only handle a single external memory, leading to data loss and unreliability if the memory fails or is detached.
Innovation Solution
A PLC data log module with internal large capacity flash memory and the ability to attach both CF and USB memories externally, allowing data storage even when these external memories are removed, using a tri-fold backup system to ensure data safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If CF memory or USB memory is used for storing PLC log data, then large capacity and fast storage time are achieved, but data loss occurs when the memory is removed or fails
Solution Approach 1:
The patent applies beforehand cushioning by implementing a tri-fold backup system that stores log data simultaneously in three locations: internal flash memory, CF memory, and USB memory. This preventive measure ensures data safety before any single storage medium fails or is removed, eliminating the need for recovery actions after data loss occurs.
Solution Approach 2:
The patent applies local quality by assigning different functions to different storage locations: internal flash memory serves as the primary reliable storage, CF memory provides large capacity storage, and USB memory offers fast access. Each storage medium is optimized for its specific role, creating a comprehensive backup system that leverages the strengths of each medium.
2Device complexity
If only a single external memory (CF or USB) is used for data storage, then device complexity is reduced, but data loss occurs when the memory fails or is detached
Solution Approach 1:
The patent implements beforehand cushioning by creating a multi-layer backup architecture where data is simultaneously written to internal flash memory and external memory media. This ensures that even if the external memory fails or is removed, the internal flash memory preserves the data, providing a safety cushion against data loss.
Solution Approach 2:
The patent applies copying by creating multiple copies of the same log data across different storage media (internal flash memory, CF memory, USB memory). This redundancy ensures that at least one copy of the data survives even if one or more storage media fail or are removed.
3Reliability
If internal flash memory is used for data storage, then data storage reliability is improved, but storage capacity is limited compared to external memories
Solution Approach 1:
The patent merges the advantages of internal flash memory (reliability, always accessible) with external memory media (large capacity, fast storage) by implementing a combined storage architecture. The system simultaneously utilizes internal flash memory for reliable baseline storage and external CF/USB memories for expanded capacity, achieving both reliability and large capacity in a unified system.
Solution Approach 2:
The patent applies universality by designing the storage system to perform multiple functions: internal flash memory provides reliable persistent storage, CF memory provides large capacity storage, and USB memory provides fast access. The system can operate with any combination of these media, making the storage solution universally adaptable to different requirements.
Data Source
AI summary
Provided is a PLC data log module and method for storing data in the same, wherein, in a case one or more storages among a plurality of outside storages is attached, a log data is stored in the attached outside storage, the log data is stored in the storage and check is made as to whether the log data is normally stored in the attached outside storage.