Enhanced Safety Logic Solver Utilizing 2oo3 Architecture with Memristor Integration

Abstract

A safety instrument function (SIF) averts hazardous incidents that may arise due to diverse anomalies within a system. The SIF prevents potential dangers by comprising three integral components—the sensing element, the logic solver, and the final element. The 2oo3 architecture is the optimal configuration for each SIF component, employing both AND and OR logic designs for its voting mechanism. Type A devices, recognized for their passive nature, exemplify robustness and reliability. While these devices are acknowledged as the most dependable, semi-conductor devices or microcontrollers, categorized as Type B, often find application in logic processing. This paper introduces the incorporation of memristors, which are inherently passive devices with memory attributes, into the system. The logic solver, which calculates confidence values, exhibited greater efficacy than Type B devices. Verification was conducted via LTspice circuit simulations. The results of the memristor for Logic Solver in the safety instrumentation function (SIF) IEC 61508/61511 standard are as follows: The voter circuit has the lowest components and failure rate and highest mean time to failure. This is more reliable than the other voter.

Keywords

• memristor
• 2oo3
• logic solver
• fail-safe