Safety Communication Monitoring with Preemptive Identifier Switching
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Solution Overview
Problem
Existing safety communication methods in industrial systems take too long to detect errors in data exchange, leading to potential uncontrolled or hazardous operating conditions.
Innovation Solution
A safety communication method that modifies the monitoring identifier for data telegrams before receiving a response, allowing for simultaneous monitoring of multiple identifiers and reducing the time to detect errors by using a predetermined timeout period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the monitoring identifier is changed only after receiving a response data telegram, then the communication protocol remains simple and easy to implement, but the error detection time increases and fault detection becomes delayed
Solution Approach 1:
The monitoring identifier is modified in advance before the timeout period expires, rather than waiting for the response to be received. This preliminary modification allows the system to detect errors faster by comparing the expected identifier with the actual response identifier, reducing the diagnostic time while maintaining protocol simplicity
Solution Approach 2:
The monitoring identifier modification timing is made dynamic - it can be adjusted based on the actual response time. The identifier is modified after a predetermined number of request data telegrams or when a timeout is detected, allowing the system to adapt to varying communication conditions and optimize error detection speed
2Reliability
If the monitoring identifier is modified after each request data telegram, then the error detection speed increases, but the system complexity and processing overhead increase
Solution Approach 1:
Instead of modifying the monitoring identifier after every single request data telegram, the modification is performed after a predetermined number of requests or based on timeout detection. This partial modification approach provides sufficient error detection capability while avoiding excessive processing overhead and protocol complexity
Solution Approach 2:
The modification strategy changes the parameters of the monitoring identifier based on communication conditions. The identifier is modified based on the number of request telegrams sent or timeout status, allowing flexible adjustment of detection sensitivity without permanently increasing system complexity
3Reliability
If a timeout detection mechanism is implemented to detect communication errors, then the safety of the system improves, but the communication protocol becomes more complex and requires additional processing
Solution Approach 1:
The timeout detection mechanism is integrated into the existing communication protocol flow, where the primary instance naturally monitors the response timing as part of its normal operation. The system serves its own safety monitoring needs using existing communication infrastructure, reducing the need for additional complex external monitoring systems
Data Source
AI summary
Apparatus and method for monitoring a communication connection, wherein in the event of a periodic transmission of a request, the request is supplemented by a specific identifier and an error is detected if a response with this identifier is not received within a predetermined period of time, where the specific identifier for a plurality of requests sent in succession is already modified before a response with a previously transmitted identifier has been received.