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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
Glossary Category
Glossary Catalog
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- Factory Acceptance Test (FAT)
- Failure Modes and Effects Analysis (FMEA)
- Failure Modes, Effects, and Diagnostic Analysis (FMEDA)
- Failure Rate (λ)
- Fault Tree Analysis (FTA)
- Final Element
- Five Nines of Reliability (99.999% Uptime)
- Fixed Programming Language (FPL)
- Full Variability Language (FVL)
- Functional Narrative
- Functional Safety Assessment (FSA)
- Functional Safety Management (FSM)
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- Machinery Safety
- Main Interlock List (MIL)
- Major Accident
- Markov Model
- Maximum Permitted Repair Time (MPRT)
- Mean Detection Time (MDT)
- Mean Repair Time (MRT)
- Mean Time Between Failure (MTBF)
- Mean Time to Fail Spurious (MTTFsp)
- Mean Time to Failure (MTTF)
- Mean Time to Restore (MTTR)
- Mechanical Integrity Program (MI)
- Mode of Operation
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- PEAR Model - People, Environment, Asset, Reputation
- Physical Failure
- Prior Use
- Probability of Failure on Demand (PFD)
- Probability of Failure per Hour (PFH)
- Probable Loss of Life (PLL)
- Process Hazard Analysis (PHA)
- Process Safety Information (PSI)
- Process Safety Management (PSM)
- Process Safety Time (PST)
- Product Safety Manual
- Programmable Electronic System (PES)
- Proof Test
- Proof Test Coverage (Cpt)
- Proof Test Interval (TI)
- Proven In Use
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- Safe Failure Fraction (SFF)
- Safety Instrumented Function (SIF)
- Safety Instrumented System (SIS)
- Safety Integrity Level (SIL)
- Safety PLC
- Safety Requirements Specification (SRS)
- Safety Torque Off (STO)
- Semi-Quantitative Risk Analysis
- SIL Certificate
- SIL Declaration of Conformity
- SIS Safety Lifecycle
- Site Acceptance Test (SAT)
- Site Integration Test (SIT)
- Smart Logic Module
- Spurious Trip Rate (STR)
- Stated Risk
- Stated Risk Tolerance
- Systematic Capability
- Systematic Failure
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