An ARM-based dual-redundant programmable logic control device and a control method thereof
By combining hardware arbitration and CRC check, the switching delay and data synchronization problems of redundant programmable logic controllers are solved, enabling rapid control switching and efficient data synchronization, and improving the system's real-time response capability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA STATE SHIPBUILDING CORP LTD RESEARCH INSTITUTE 719
- Filing Date
- 2026-06-04
- Publication Date
- 2026-07-17
AI Technical Summary
Existing redundant programmable logic controllers rely on software arbitration, resulting in large switching delays, easy omission of system crashes, and excessive computing power consumption for full data synchronization, leading to extended system response cycles.
An independent output switching arbitration circuit employs hardware arbitration interrupt triggering logic and software arbitration voting logic, combined with a low-level hardware anti-crash heartbeat mechanism using PWM wave and RC filtering. Prioritizes CRC checksum comparison and triggers byte-by-byte comparison in case of an anomaly, thereby achieving rapid switching and data synchronization between the primary and backup MCUs.
It achieves microsecond-level control switching, ensures continuous control output, reduces CPU computational load and communication frequency, and improves the system's real-time response capability.
Smart Images
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