Field Device Change Detection for Measurement Data Retrieval
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Solution Overview
Problem
Current data exchange methods between control units and field devices in measurement systems, such as fill-level, pressure, point level detection, and flow measurement systems, result in excessive data transfer and inefficient communication, leading to sluggish operations and high data traffic, especially when parameter changes or diagnostics are involved.
Innovation Solution
Implementing a method where field devices determine changes in measured values, diagnostic information, and device parameters, and only transmit these changes to the control unit, using a 'marker' to indicate dependencies, allowing for selective data retrieval and reducing unnecessary data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all device parameters, measured values and diagnostic information are continuously transferred from field device to control unit, then complete data availability is ensured, but data traffic increases and communication efficiency decreases
Solution Approach 1:
The patent extracts and transfers only the changed parameters, measured values and diagnostic information from the field device to the control unit, rather than continuously transferring all data. This selective extraction is achieved by comparing current data with previously transferred data and identifying only those elements that have changed, thereby reducing data traffic while maintaining complete data availability.
Solution Approach 2:
The patent applies partial action by transferring only the necessary subset of data (changed elements) rather than the complete data set. The control unit requests specific data elements based on change detection, and only those changed elements are transferred, avoiding the excessive data transfer of continuous monitoring approaches.
2Loss of time
If parameter changes trigger immediate data retrieval from field device, then data freshness is improved, but waiting time and operational sluggishness increase
Solution Approach 1:
The patent implements preliminary action by detecting parameter changes at the field device before data retrieval is initiated. Change detection markers are set in advance when parameters change, allowing the control unit to efficiently retrieve only changed data without waiting for complete data sets, thus improving data freshness while minimizing waiting time.
3Stability of the object's composition
If complete data sets are transferred for every parameter change, then data consistency is ensured, but data volume and communication overhead increase
Solution Approach 1:
The patent segments the complete data set into individual parameter elements, measured values and diagnostic information items. Instead of transferring complete data sets, only the specific changed elements are identified and transferred individually. This segmentation maintains data consistency for changed elements while significantly reducing the data volume transmitted.
4Reliability
If continuous monitoring of all parameters is performed, then complete system awareness is achieved, but processing load and complexity increase
Solution Approach 1:
The patent implements self-service by enabling the field device to autonomously detect and identify its own changed parameters, measured values and diagnostic information. The field device compares current data with previously transferred data, sets change detection markers, and prepares only changed elements for transfer. This self-service approach reduces the processing load on the control unit while maintaining complete system awareness.
Data Source
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AI summary
The system (100) has a level measuring device (3) for determining whether a current measured value differs from a recorded measured value, a current item of diagnostic information differs from a preceding item, or a current device parameter is changed due to another device parameter. A control unit retrieves the current measured value, the current item or the current device parameter from the measuring device when the measuring device determines a difference between the measured values or the items of diagnostic information, or the device parameter is changed. Independent claims are also included for the following: (1) a method for loading device parameters, measured values and items of diagnostic information into a user interface (2) a program element for a level measuring system (3) a computer-readable medium comprising a set of instructions for loading device parameters, measured values and items of diagnostic information into a user interface (4) a pressure measuring system (5) a limit detection system (6) a flow measuring system.