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Time Related
This glossary category covers key time-related concepts used in functional safety, including proof test intervals, mean time to failure, spurious trip rates, and response times. These time values are essential to how SIL calculations and SIF performance are evaluated.
- Lifetime
- 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)
- Process Safety Time (PST)
- Proof Test Interval (TI)
- Response Time
- Spurious Trip Rate (STR)
- Useful Life
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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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