Fieldbus Message Learning for Reliable Diagnostic Mode Switching
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Solution Overview
Problem
Existing methods for triggering diagnostic modes in field devices for process measurement technology can be time-consuming and unreliable, especially when status variables are incorrectly captured.
Innovation Solution
The method involves capturing and storing fieldbus messages in a learning mode, creating learning data sets when a status rule is fulfilled, and deriving a message rule from these data sets to trigger diagnostic modes, potentially replacing the need for capturing status variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If status variables are captured and evaluated to trigger diagnostic modes, then diagnostic accuracy is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent creates a copy of the relevant information from status variables by generating fieldbus messages that represent the status state. Instead of directly capturing and evaluating status variables, the system captures fieldbus messages that contain or represent the same diagnostic information, thereby reducing the need for dedicated status variable capture equipment while maintaining diagnostic reliability.
Solution Approach 2:
The patent introduces fieldbus messages as an intermediary between the status variables and the diagnostic evaluation process. Rather than directly accessing status variables, the system uses fieldbus messages that carry status information as a mediator, simplifying the overall system architecture and reducing equipment requirements.
2Reliability
If status variables are captured to ensure reliable diagnostic mode activation, then diagnostic reliability is improved, but time consumption increases
Solution Approach 1:
The patent performs preliminary action by capturing and storing fieldbus messages in advance during normal operation. When a diagnostic mode activation condition is detected, the system can immediately use the pre-captured fieldbus messages without needing to capture and process status variables at that moment, thereby reducing time consumption while maintaining reliability.
3Productivity
If field devices are operated in normal mode with status monitoring, then process continuity is maintained, but diagnostic capabilities are not activated when needed
Solution Approach 1:
The patent implements feedback by continuously monitoring fieldbus messages during normal operation and using this information to automatically trigger diagnostic modes when specific conditions are met. The system evaluates captured fieldbus messages against predefined criteria and provides feedback by activating diagnostic mode when the evaluation indicates a diagnostic situation has arisen, ensuring both process continuity and timely diagnostic activation.
Data Source
AI summary
A method for operating a field device for process measurement technology includes: capturing and storing fieldbus messages in a learning mode; in a plurality of capture steps, at least partially storing the captured and stored fieldbus messages as a learning data set in each case if a status rule of the field device is fulfilled, so that a plurality of learning data sets are captured; in an evaluation step, evaluating a plurality of learning data sets to derive a message rule dependent on at least one fieldbus message for changing from normal mode of the field device to diagnostic mode of the field device; and applying, by the field device, the message rule for changing from the normal mode of the field device to the diagnostic mode of the field device instead of or in addition to the status rule.