IEC 61508: Diagnostic Design — Watchdogs, Self-Tests, and Claiming Diagnostic Coverage

Date
2026-10-13
Location
Online
Host
Zach L

About this event

A live 30-minute expert session on Diagnostic Design — Watchdogs, Self-Tests, and Claiming Diagnostic Coverage (IEC 61508 — Functional Safety Foundations). What We'll Cover: What diagnostic mechanisms are and where diagnostic design sits in E/E/PE hardware and software development The core method step by step: choosing mechanisms per failure mode, DC estimation from Part 2 tables, and fault-reaction design How claimed coverage maps to IEC 61508-2 Annex A/C tables and the FMEDA diagnostic columns Common mistakes: watchdogs that share failure modes with the CPU, untested diagnostics, and slow diagnostic test intervals The diagnostic verification tests and fault-insertion evidence backing every DC percentage an assessor checks Related topics: diagnostic coverage · watchdog design · self test

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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

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.
Functional safety management
Planning, competence, documentation and assessment wrapped around technical work.
Safe state
The defined condition a function drives the equipment to on demand or fault.

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.