Safety Communication Device Error Threshold Management
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Solution Overview
Problem
In communication systems using non-safety networks, existing technologies fail to guarantee a bit error rate that meets safety integrity levels, leading to unreliable fail-safe operations and excessive system unavailability due to inappropriate threshold settings.
Innovation Solution
A safety communication device with a safety layer that performs error detection on non-safety layer data, acquiring and comparing error detection characteristics from both safety and non-safety layers to set a threshold value based on requested error rates, ensuring safe operation when bit errors exceed the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fail-safe operation is performed when the bit error rate exceeds a threshold value in a non-safety network, then system safety is improved, but the bit error rate cannot be guaranteed to satisfy the request value
Solution Approach 1:
The patent performs preliminary error detection at the non-safety layer before data reaches the safety layer. By detecting and handling errors early in the transmission process, the system can maintain safety guarantees without relying solely on safety layer error detection, thus resolving the contradiction between system safety and bit error rate measurement precision.
2Device complexity
If error detection is performed only at the safety layer, then device complexity is reduced, but excessive fail-safe operations occur due to undetected errors from the non-safety layer
Solution Approach 1:
The patent segments error detection functionality into two distinct layers: non-safety layer error detection and safety layer error detection. Each layer performs error detection independently with appropriate threshold settings, preventing excessive fail-safe operations while maintaining system availability. This segmentation resolves the contradiction by distributing detection responsibilities rather than concentrating all detection at one layer.
3Ease of operation
If a single threshold value is used for error detection, then ease of operation is improved, but inappropriate threshold settings cause excessive fail-safe operations
Solution Approach 1:
The patent applies different threshold values at different layers: a first threshold value at the non-safety layer and a second threshold value at the safety layer. Each threshold is optimized for its specific layer's error characteristics and safety requirements. This local differentiation resolves the contradiction by allowing appropriate threshold settings at each layer rather than using a single inappropriate threshold throughout.
Data Source
AI summary
A safety communication device includes: a safety layer parameter acquisition part to acquire a reception bit rate of safety layer data being received per unit time; a threshold value setting part to set a request error rate requested as an upper limit of a bit error rate of the safety layer data received per unit time, on the basis of a request value corresponding to a bit error rate request being requested as an upper limit of an error occurrence probability per bit during data communication in a non-safety network, and a reception bit rate; and a safety monitoring control part to compare the bit error rate of the safety layer data received within a unit time, with the request error rate, and to perform safety control on the basis of a comparison result.