RFID Safety Switch Interface for Multi-Actuator Signal Integrity
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Solution Overview
Problem
Existing safety devices face challenges in reliably transmitting and generating safety switching signals and other output signals to a safety controller without fail, especially in complex applications with multiple actuators, which is crucial for ensuring machine safety.
Innovation Solution
A safety device with a safety switch that reads actuator data via RFID, generates safety switching signals, and outputs all signals through a secure serial or bus interface, ensuring fail-safe transmission using checksums and redundant computer structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple actuators are used to detect different positions in complex applications, then the monitoring function is enhanced, but the complexity of signal generation and transmission increases
Solution Approach 1:
The patent segments the signal transmission by assigning unique identification numbers to each actuator. The safety switch reads actuator data including these identification numbers and generates specific output signals for each actuator through a safe serial interface or safe bus interface. This segmentation allows multiple actuators to be managed independently with distinct signals, enhancing monitoring versatility while maintaining organized signal transmission.
Solution Approach 2:
The safe output structure (safe serial interface or safe bus interface) serves as a universal transmission medium that handles all actuator signals through a single standardized interface. This multi-functional interface can transmit multiple different output signals simultaneously, eliminating the need for separate dedicated transmission paths for each actuator and reducing overall system complexity.
2Reliability
If actuator data is transmitted reliably to the safety controller, then machine safety is ensured, but the transmission system requires fail-safe mechanisms that increase complexity
Solution Approach 1:
The safety switch reads actuator data through an RFID system and generates output signals that are transmitted via the safe output structure. The system includes feedback mechanisms where the safety controller receives these signals and can monitor the state of each actuator. This feedback loop ensures reliable transmission by continuously verifying actuator positions and states, maintaining safety without requiring overly complex redundant systems.
Solution Approach 2:
The patent implements selective signal transmission where only relevant actuator data and specific output signals are transmitted through the safe output structure. Rather than transmitting all possible data continuously, the system transmits partial information as needed based on actuator activation, reducing transmission complexity while maintaining reliability for critical safety signals.
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
Ensures reliable and fail-safe transmission of all output signals, including safety switching signals, enhancing the fault tolerance and functionality of the safety device, allowing for complex monitoring and control functions with minimal design effort.
Implementation Method 1
Common safety switches feature an RFID system with a transponder integrated into the actuator and a reader integrated into the safety switch
Data Source
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Figure 5
AI summary
The invention relates to a safety device (1) comprising a safety switch (4), an arrangement of actuators (8) associated with the safety switch (4), and a safety controller (3). The safety switch (4) is configured to read actuator data from the actuator (8) and, depending on the data from the actuator (8), to generate safety switching signals and output them to the safety controller (3). The safety switch (4) has a safe output structure (5) in the form of a safe serial interface or a safe bus interface, through which all output signals are output. The invention further relates to a method for operating a safety device (1).