OT Network Segmentation via SIL Encoding for Critical Alert Prioritization
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Solution Overview
Problem
Existing technologies fail to effectively prioritize operational technology (OT) control systems in a Safety Instrumented System (SIS) environment based on Safety Integrity Level (SIL) values, leading to inefficient alerting and delayed critical action responses.
Innovation Solution
A method and system that utilize network packets to encode SIL values, allowing for prioritization of OT control systems by associating them with corresponding network tags, ensuring that critical systems receive immediate attention based on their SIL values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all OT control systems are alerted equally regardless of SIL value, then comprehensive monitoring is achieved, but response efficiency to critical events deteriorates
Solution Approach 1:
The patent segments OT control systems into different priority groups based on their SIL values (SIL 1, SIL 2, SIL 3, SIL 4). Each segment receives differentiated alerting and response procedures, allowing critical systems (SIL 4) to be handled separately from less critical systems. This segmentation enables the system to maintain comprehensive monitoring while providing prioritized response to critical events, directly resolving the contradiction between comprehensive monitoring and response efficiency.
2Device complexity
If traditional network segmentation without SIL-based prioritization is used, then system simplicity is maintained, but safety operation effectiveness deteriorates
Solution Approach 1:
The patent introduces SIL values as a new parameter for network segmentation and prioritization. By encoding SIL values in network packets and using them to determine priority levels, the system transforms the traditional flat network structure into a hierarchical structure based on safety integrity requirements. This parameter change enables more effective safety operations while maintaining reasonable system complexity through standardized implementation.
3Loss of time
If SIL-based prioritization is implemented, then response efficiency to critical events is improved, but system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-defining priority levels and response procedures for each SIL value before events occur. The system pre-encodes SIL values in network packets and establishes predetermined alerting and response protocols. This preliminary configuration reduces the complexity of real-time decision-making, as the system only needs to follow pre-established procedures when events occur, thereby improving response efficiency without proportionally increasing operational complexity.
4Loss of energy
If integration of critical OT control systems and SIS environment is pursued, then cost reduction is achieved, but safety isolation effectiveness deteriorates
Solution Approach 1:
The patent applies local quality by implementing differentiated network segmentation and prioritization for different SIL levels within the integrated system. Critical systems (SIL 4) receive enhanced protection and isolation measures, while less critical systems can share resources more freely. This localized approach to security and isolation enables cost-effective integration while maintaining appropriate safety boundaries where they are most needed, resolving the contradiction between cost reduction and safety isolation effectiveness.
Data Source
AI summary
Embodiments relate to a method for enhancing and prioritizing operation technology (OT) control systems in a safety instrumented system (SIS) environment by incorporating safety levels. The method includes receiving network packets associated with OT systems by network interface. From network packets, OT systems associated with safety integrity level (SIL) values are identified. In response to identifying OT control systems associated with SIL values, determining priority levels from SIL values of OT systems. The method includes identifying, among OT control systems, network packets associated with a critical OT system associated with a SIL value having a higher priority level. The critical OT system may be prioritized that comprises encoding the network packets of the critical OT system, with corresponding SIL value. The prioritized critical OT system may be prioritized based on SIL value and classified into a network group associated with a network tag to deliver traffic with higher priority.