Data Acquisition Apparatus Local Storage Re-Transmission
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Solution Overview
Problem
SCADA systems face data loss during communication disconnections between data acquisition apparatus and history servers, as they lack effective mechanisms to manage and re-transmit data when transmission is unsuccessful.
Innovation Solution
A data acquisition apparatus with a local storage unit and control unit that transmits data to a history server when capacity is exceeded, deletes data upon successful transmission confirmation, maintains data upon failure, and re-transmits data when communication is restored, ensuring data integrity and real-time storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted regularly from the data acquisition apparatus to the history server, then data can be stored remotely, but data is lost when communication is disconnected
Solution Approach 1:
The data acquisition apparatus performs preliminary action by storing acquired data in its own storage unit before transmission to the history server. This ensures data is safely cached locally and can be re-transmitted when communication is restored, preventing data loss during disconnection events.
Solution Approach 2:
The system implements feedback by having the history server send transmission result information back to the data acquisition apparatus. Based on this feedback, the apparatus determines whether to delete locally stored data or re-transmit it, ensuring data integrity while managing storage efficiently.
2Reliability
If data is stored locally in the data acquisition apparatus, then data can be protected during communication failures, but storage capacity is limited
Solution Approach 1:
The system performs preliminary action by storing data locally only temporarily before transmission. Once the history server confirms successful reception, the local data is deleted. This preliminary local storage protects data during communication failures while minimizing the required storage capacity.
Solution Approach 2:
The system applies discarding and recovering by deleting data from local storage after successful transmission confirmation. This frees up storage capacity for new data while ensuring previously transmitted data is preserved in the history server, effectively managing limited local storage resources.
3Productivity
If data is deleted after transmission, then local storage is freed, but data may be lost if transmission fails
Solution Approach 1:
The system uses feedback from the history server regarding transmission results to control data deletion. Data is deleted only when the server confirms successful reception, ensuring data safety. If transmission fails, the data remains in local storage for re-transmission, maintaining both reliability and storage efficiency.
Data Source
AI summary
A data acquisition apparatus is provided. The data acquisition apparatus includes a local data storage unit; a data acquisition unit acquiring data; and a control unit storing data acquired by the data acquisition unit in the local data storage unit, wherein when stored data exceeds a predetermined capacity, the control unit transmits data to a history server, and when it is confirmed by the history server that data transmission is successful, the control unit deletes corresponding data from the local data storage unit.