Safety System Operating Mode Selection via Transponder Authentication
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Solution Overview
Problem
Existing safety systems for machines fail to securely restrict operating mode changes to authorized personnel due to vulnerabilities in key copying and access control, lacking the necessary safety level required by legal regulations.
Innovation Solution
A method and safety system utilizing a two-channel signal reading and error checking process, where the safety controller enables operating mode selection only with valid signals, and error checks are performed across components to ensure fail-safe mode switching, employing a diverse output structure and checksum calculations for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If key switches or buttons are used for operating mode selection, then ease of operation is improved, but security and reliability deteriorate due to key copying vulnerabilities and insufficient access control
Solution Approach 1:
An electronic key system with transponder acts as an intermediary between the user and the operating mode selection. The key insert reads the transponder code and communicates with the control system, providing secure authentication before enabling mode selection on the input unit.
Solution Approach 2:
The mechanical key switch system is replaced with an electronic key system using transponders and readers. This substitution eliminates physical key copying vulnerabilities while maintaining ease of operation through contactless identification.
2Reliability
If safety technology is implemented for operating mode switching, then reliability and security are improved, but device complexity increases
Solution Approach 1:
The electronic key system serves multiple functions: it provides secure authentication, enables operating mode selection, and integrates with the existing input unit and display. This multi-functionality reduces the need for separate dedicated safety devices.
Solution Approach 2:
The system implements feedback through the display unit, which shows information about the current operating mode and authentication status. This provides users with clear feedback about system state without requiring additional complex control mechanisms.
3Reliability
If two-channel reading with error checks is implemented, then error security and reliability are improved, but device complexity and processing requirements increase
Solution Approach 1:
The signal validation process is segmented into two independent channels: one for reading transponder data and another for error checking. This segmentation allows parallel processing of validation tasks, improving reliability without creating a single complex validation module.
Solution Approach 2:
The system performs error checks on selected portions of the signal transmission process rather than entire signal streams. Checksum calculations are applied selectively to critical data fields, providing sufficient error security without excessive processing overhead.
Data Source
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AI summary
The invention relates to a method for setting an operating mode of a safety system (1), comprising an access system connected to a control system (2) that controls a machine. The control system (2) includes a safety controller (4). The method comprises the following steps: • Dual-channel reading of signals from the access system into the control system (1) • Performing a validity check of the signals from the access system in the control system (2) • wherein the control system (2) only enables the selection of an operating mode via the input unit (10) if valid signals from the access system are present. • Performing an error check of the selected operating mode in the safety controller (4) • Switching to the selected operating mode by the safety controller (4) after successful error checking.