Mobile RFID Operator with Simulated Reference Transponders
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Solution Overview
Problem
Existing safety-relevant environments in plants restrict the operation of machines to stationary points or cabled devices, limiting the use of wireless technologies due to safety concerns, and there is a need for a method to ensure correct processing of radio signals for safe operation.
Innovation Solution
A mobile operating device with a read device for receiving RFID transponder signals and an evaluation unit, utilizing simulated reference transponders and a delay line to check the entire transmission chain of hardware and software components for accurate distance measurement and identification, ensuring safe operation within defined effective ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless transmission technologies are used to operate machines from any location, then operational flexibility and mobility are improved, but safety risks increase due to inability to verify signal integrity and distance measurement accuracy
Solution Approach 1:
The system performs preliminary verification of the transmission chain by comparing measured distance values with pre-stored expected values before allowing machine operation. This advance check ensures signal integrity and prevents unsafe operations, resolving the contradiction by establishing safety protocols that enable wireless operation without compromising reliability.
Solution Approach 2:
The system implements feedback mechanisms where distance measurement results are continuously monitored and compared against expected values. When deviations are detected (indicating potential 'Stuck AT' errors or signal interference), the system provides feedback to halt operation or alert operators, thus maintaining safety while enabling flexible wireless operation.
2Ease of manufacture
If standard components are used to develop operating devices, then development costs and manufacturing complexity are reduced, but safety function verification becomes more difficult due to variability in component performance
Solution Approach 1:
The system compensates for component variability by dynamically adjusting verification parameters. Instead of relying on fixed thresholds, it compares measured distance values against expected values calculated from known transponder positions and signal propagation characteristics. This approach maintains measurement precision despite using standard components, resolving the contradiction between ease of manufacture and measurement accuracy.
3Reliability
If the entire transmission chain is verified for every operation, then safety and reliability are improved, but processing time and system complexity increase
Solution Approach 1:
The system performs a focused verification by comparing only the critical distance measurement parameter against expected values, rather than进行全面 verification of all transmission chain components. This partial verification approach maintains safety assurance while minimizing verification time, resolving the contradiction between reliability and time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe operation of machines within safety-relevant environments by verifying the integrity of the transmission chain, preventing errors like 'Stuck AT' and ensuring correct distance measurement and identification, thus enhancing safety and reliability.
Implementation Method 1
a read device (8) for receiving the radio signals sent out by RFID transponders (5)
Implementation Method 2
If the reference transponder signals of the reference transponder modulated upwards in the read device are delayed by means connected downstream from the read device, through which an additional distance is simulated, the correct distance measurement and evaluation of the correct distance measurement can be checked in this way.
Data Source
AI summary
There is described a method to operate a mobile operating device and a mobile operating device, with which machines within of effective ranges which are spanned by RFID transponders can be operated wirelessly. A safety module is provided in the operating device, with which both measured values assigned to the RFID transponders and also reference values of two reference transponders simulated in the operating device are checked in order to ensure the correct measurement and further processing in this way.