IEC 61508: Fault Tree Analysis for SIL Verification

Date
2027-04-26
Location
Online
Host
Zach L

About this event

A live 30-minute expert session on Fault Tree Analysis for SIL Verification (IEC 61508 — Functional Safety Foundations). What We'll Cover: What FTA is and where it fits in SIL verification within the IEC 61508 realization phase The core method step by step: top event definition, gate logic, basic-event data, cut sets, and quantification How FTA complements the Part 6 simplified equations and produces the SIL verification evidence pack Common mistakes: missing common cause events, wrong test-interval modeling, and confusing PFD with unavailability The model assumptions and data provenance an assessor checks against the FMEDA and safety manual Related topics: fault tree analysis · fta · sil verification · pfd calculation · minimal cut sets · common cause failure · redundant architectures · 1

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About Functional Safety Foundations

This online session delivers expert-led instruction on the regulatory landscape and implementation approach for Functional Safety Foundations.

The cross-sector fundamentals underlying every functional safety standard: risk as severity × likelihood, the safety function concept, integrity levels, the safety lifecycle, and the split between random and systematic failures.

What it regulates

Shared vocabulary and reasoning: hazard → risk → risk reduction allocation → safety requirement → verified implementation → maintained integrity in operation.

Who must comply

Everyone entering the field — the conceptual base of the entire catalog.

Key requirements of Functional Safety Foundations

  • Hazard and risk fundamentals
  • Safety function anatomy: sensor-logic-actuator with defined safe state
  • Integrity ladders (SIL/PL/ASIL/DAL) as risk-reduction currencies
  • Random vs systematic failure treatment
  • Lifecycle and management of functional safety incl. competence

Key concepts: Functional Safety Foundations

Safe state
The defined condition a function drives the equipment to on demand or fault.
Functional safety management
Planning, competence, documentation and assessment wrapped around technical work.
Random vs systematic
Hardware wear-out/chance failures quantified statistically versus design/process errors controlled by rigor.
Risk reduction allocation
Distributing required risk reduction among mechanical design, safeguards, control functions and procedures.

Frequently asked questions: Functional Safety Foundations

Why can't testing alone prove safety?

Rare-event targets (like 1e-7/h) are unverifiable by test duration, and systematic errors evade random testing — hence the standards' dual machinery of quantified hardware analysis plus process rigor and independent assessment.

Standard information based on the published text of Functional Safety Foundations. Event content is provided by the host. For authoritative guidance, consult the official standard body.