RFID Tag Activation via Magnet and Reed Switch for Safety State Detection
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Solution Overview
Problem
Conventional systems for determining operational safety in industrial automation processes rely on 'fault exclusion,' which is no longer acceptable under newer safety standards like EN ISO 13849 Performance Level e and EN 62061, requiring more precise measurement of safety integrity levels (SIL) by quantifying operations of components like locking mechanisms.
Innovation Solution
A system utilizing a magnet and reed switch to activate/deactivate RFID tags, allowing for the determination of operational states and positions, thereby enhancing safety integrity levels by providing detailed information on the operation of components such as locking mechanisms, which can be used to improve SIL rankings and facilitate safe operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fault exclusion is used to simplify safety determination, then device complexity is reduced, but measurement precision of safety integrity level deteriorates
Solution Approach 1:
The locking mechanism is divided into multiple discrete operational states (gate closed, gate locked, locking shaft engaged) each monitored by separate sensing elements. This segmentation allows precise tracking of each state while maintaining manageable system complexity through modular tag-based monitoring.
Solution Approach 2:
RFID tags serve as intermediary elements between the physical locking mechanism and the safety control system. The tags encode operational states and provide reliable signal transmission to OSSDs, enabling precise SIL measurement without direct complex wiring or sensing infrastructure.
2Reliability
If redundant locking mechanisms are provided to achieve fault exclusion, then reliability is improved, but device complexity increases
Solution Approach 1:
The system implements feedback through RFID tags that continuously report the operational state of locking components to the safety control system. This feedback mechanism provides reliable verification of locking status without requiring redundant physical locks, maintaining reliability while avoiding complexity multiplication.
3Measurement precision
If operational states are quantified with detailed information, then measurement precision of safety integrity level is improved, but loss of information increases
Solution Approach 1:
RFID tags create information copies of the locking mechanism's operational states. Each tag encodes specific state information (closed, locked, engaged) and transmits it to the control system, enabling precise SIL measurement through information replication rather than direct continuous monitoring of physical parameters.
4Ease of operation
If conventional fault exclusion approach is used, then ease of operation is improved, but adaptability to newer safety standards deteriorates
Solution Approach 1:
The RFID-based operational state detection system serves multiple functions: it provides precise SIL measurement, generates information for OSSD control, enables detailed operational logging, and supports compliance with evolving safety standards. This multi-functional approach maintains ease of operation while ensuring future adaptability to stricter regulations.
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
This approach enables improved safety ratings by providing detailed operational information, allowing for enhanced logging and control of device operations, thereby meeting the requirements of newer safety standards and improving overall operational safety.
Implementation Method 1
A magnet in combination with a reed switch is utilized to facilitate activation/deactivation of a plurality of radio-frequency identification (RFID) tags
Implementation Method 2
an RFID tag associated with the first position is activated and transmits a first RFID identifier
Data Source
AI summary
Systems and methods are provided relating to utilizing a plurality of RFID tags in conjunction with a circuit comprising at least one reed switch to facilitate determination of operational states and actions based thereon. A magnet can activate the reed switch causing a first RFID tag to be activated and transmit an associated RFID identifier from which a position/operation associated with the first RFID can be determined. The magnet can be removed to activate a second RFID tag whereupon a second RFID identifier is transmitted from which a second position/operation can be determined. The circuit comprising the reed switch and RFID tags can have an induction coil enabling the circuit to be activated when the induction coil is brought into proximity of a second induction coil and inductively coupled.