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Key Concepts
These key concepts are some of the most foundational and important terms in all of Functional Safety. This is SIL Safe’s running list of the most important concepts in this ecosystem.
- Architecture (1oo1, 2oo3, etc.)
- Common Cause Failure (CCF)
- Demand Rate
- Diagnostic Coverage (DC)
- Failure Rate (λ)
- Final Element
- Functional Safety Management (FSM)
- Hardware Fault Tolerance (HFT)
- Hazard and Operability Study (HAZOP)
- Hazard and Risk Assessment (H&RA)
- Independent Protection Layer (IPL)
- Layer of Protection Analysis (LOPA)
- Logic Solver
- Mode of Operation
- Probability of Failure on Demand (PFD)
- Process Safety Management (PSM)
- Process Safety Time (PST)
- Risk Reduction Factor (RRF)
- Safe Failure Fraction (SFF)
- Safety Instrumented Function (SIF)
- Safety Instrumented System (SIS)
- Safety Integrity Level (SIL)
- Safety Requirements Specification (SRS)
- SIS Safety Lifecycle
- Spurious Trip Rate (STR)
- Systematic Capability
- Systematic Failure
- Validation
- Verification