RFID Safety Interlock Control for Industrial Machine Access
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Solution Overview
Problem
Existing safety systems for industrial machines and plants rely on mechanical actuators, which are not highly secure, as they do not accurately identify operators and can be unlocked or locked from outside, posing risks during machine operation and access control.
Innovation Solution
A system using electronic control devices and actuators with unique identification codes, eliminating mechanical components, ensures secure access control and machine operation by verifying operator presence and preventing unauthorized access or restarts through RFID tags and control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical actuators and keys are used for access control, then the system is easier to manufacture and operate, but the security and reliability of operator identification deteriorates
Solution Approach 1:
The patent replaces mechanical actuators and keys with electronic actuators and RFID tags. The mechanical key insertion and turning mechanism is substituted with an electronic reader that detects RFID tags wirelessly, eliminating mechanical wear and improving identification reliability through electronic verification of operator credentials.
Solution Approach 2:
The patent introduces RFID tags as an intermediary between the operator and the access control system. The tags carry identification information that is read wirelessly by the control system, providing a reliable intermediate verification step that confirms operator authorization without requiring direct mechanical interaction.
2Reliability
If mechanical keys are used for access control, then the device complexity is reduced, but the security against unauthorized access deteriorates
Solution Approach 1:
The patent replaces mechanical locking mechanisms with electronic actuators controlled by verification of RFID tag data. The electronic system can verify operator authorization through wireless communication and database verification, providing enhanced security against unauthorized access compared to mechanical key systems that can be duplicated or lost.
Solution Approach 2:
The patent implements a feedback mechanism where the control system reads RFID tag information, verifies it against stored authorization data, and then decides whether to activate the electronic actuator. This closed-loop verification process ensures that only authorized operators can access the perimeter, with the system automatically responding to verification results.
3Reliability
If mechanical locking systems are used, then the ease of operation is improved, but the prevention of unauthorized machine restarts deteriorates
Solution Approach 1:
The patent replaces mechanical locking systems with electronic actuators that are controlled by RFID verification. The electronic system can prevent machine restarts by verifying operator authorization through RFID tags, ensuring that only authorized personnel can initiate restart procedures, while the electronic interface provides ease of operation through wireless communication.
Solution Approach 2:
The patent implements a self-service system where operators present their RFID tags for automatic verification and access control. The system automatically reads the tag, verifies authorization, and controls the actuator without requiring manual intervention or complex mechanical key manipulation, improving both security and ease of operation.
4Measurement precision
If RFID tags with unique identification codes are used, then the security and operator identification accuracy improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces mechanical identification systems with RFID tags containing unique identification codes. The electronic reader detects these codes wirelessly and transmits them to the control system for verification, providing high-precision operator identification through electronic data processing rather than mechanical key recognition.
Solution Approach 2:
The patent makes the RFID tags and readers universal components that can identify and authenticate multiple different operators. The system uses a standardized RFID protocol that allows any authorized operator with a compatible tag to be identified and authenticated, providing multi-functional capability across different access points and machine restart scenarios.
Data Source
AI summary
A system for the safe control of safety protections comprises at least one first control device (2) placed outside the safety perimeter (P) for sending commands to stop and enable the machine or plant (M) following the opening/closing of the accesses (A1, A2), a first safety switch (3) placed close to one or more of the accesses (A1, A2) for their locking and/or unlocking, one or more actuators having a transponder with identification code for interacting with the first control device and/or safety switch, at least one control unit operatively connected to the first control device and to the safety switch to receive the actuation commands and enable the operation of the machine or plant (M) between an operating condition of fully operation and a safety operating condition. Second means are also provided for enabling the exit from the safety perimeter (P) for one or more operators.