ISO 13849: MTTFd from B10d — Worked Calculations for Electromechanical Components

Date
2026-10-12
Location
Online
Host
Zach L

About this event

A live 30-minute expert session on MTTFd from B10d — Worked Calculations for Electromechanical Components (ISO 13849 — Machinery Safety). What We'll Cover: What B10d and MTTFd are and where component reliability data enters the ISO 13849 quantification lifecycle The nop formula step by step: operating days, hours, cycle time, and the B10d/0.1·nop conversion with real contactor numbers How channel MTTFd caps (100 years, 2500 for Category 4) map to the standard and the parts-count worksheet you produce Common mistakes: using B10 instead of B10d, unrealistic nop assumptions, and ignoring the symmetrization formula for asymmetric channels The component data sources, datasheet citations, and calculation records an auditor traces during PL verification Related topics: mttfd calculation · b10d ·

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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

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.
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.