Digital Write Protection Locks for Multi-Client Field Device Access
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Solution Overview
Problem
Traditional lockout-tagout (LOTO) and manual write protection procedures in industrial process plants are inconvenient and unsafe, as they require physical access to equipment, can be compromised if the key holder is unavailable, and do not account for the complex ownership and communication link relationships in modern process control systems.
Innovation Solution
A digital safety lock and digital write protection lock system that uses a locking party's identification and key to secure and isolate field devices in a process control system, allowing secure access and control without physical presence, and managing multiple owners and communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional physical lockout-tagout procedures are used to secure field devices, then physical access and key management are required, but this creates safety risks and inconvenience when key holders are unavailable
Solution Approach 1:
The patent replaces the mechanical physical lockout system with a digital electronic locking system. The digital lock uses electronic authentication (passwords, biometrics, or communication protocols) instead of physical keys and locks. This substitution eliminates the dependency on physical key holders being present while maintaining secure isolation of field devices, thereby improving both reliability and ease of operation.
Solution Approach 2:
The patent introduces a digital intermediary layer (the digital lock system with authentication mechanisms) between the operator and the field device. This intermediary verifies authorization through digital credentials or communication protocols before allowing access, replacing the direct physical key-lock mechanism. This resolves the contradiction by enabling secure access without requiring the original key holder's physical presence.
2Reliability
If manual write protection procedures are used to prevent unauthorized modifications, then physical access to equipment is required, but this reduces efficiency and increases complexity in multi-client environments
Solution Approach 1:
The patent replaces manual physical write protection procedures with automated digital write protection mechanisms. The system uses electronic authentication and authorization protocols to control write access to field device configurations. This automation eliminates the need for manual physical intervention while managing multiple clients simultaneously, thereby improving productivity without compromising the reliability of protection against unauthorized modifications.
Solution Approach 2:
The patent implements dynamic write protection that can be selectively applied and removed through digital authentication. Unlike static manual write protection, the digital system can dynamically grant or revoke write access based on authorization credentials, allowing efficient coordination among multiple clients. This dynamic approach maintains reliable protection while significantly improving productivity in multi-client environments.
3Reliability
If physical locks are used to secure field devices, then direct physical access is needed, but this increases device complexity and reduces adaptability to modern communication-based control systems
Solution Approach 1:
The patent replaces the entire mechanical physical access infrastructure (locks, keys, physical barriers) with a digital communication-based authentication system. The digital lock utilizes electronic credentials, passwords, biometric authentication, or communication protocols to secure field device access. This substitution maintains reliable security while dramatically reducing device complexity by eliminating physical locking mechanisms and their associated infrastructure.
Solution Approach 2:
The patent implements a universal digital authentication system that can work across multiple field devices and communication protocols without requiring device-specific physical locks. The digital lock provides multi-functional security that adapts to different control systems and communication interfaces, reducing overall system complexity while maintaining reliable security. This universal approach replaces numerous device-specific physical locking mechanisms with a single standardized digital solution.
Data Source
AI summary
A digital write protection lock of a field device activates in response to receiving a request from a locking party, placing the device into a write protection mode. While the device is in the write protection mode, only the locking party may modify the configuration of the device. While in the write protection mode, the device may provide an indication of the locking party to another device or application attempting to access or control the write protected device. Other devices, applications, and users may communicate with the locking party or locking party device to request that the device be unlocked and/or to request the corresponding digital write protection lock key. Upon the device receiving the correct digital write protection lock key, the digital write protection lock may be deactivated, and the device may enter into an unlocked state if no other digital write protection locks remain activated for the device.