ISO 13849: Safety-Rated Speed Monitoring and Drive-Integrated Functions (STO, SS1, SLS)

Date
2027-02-22
Location
Online
Host
Zach L

About this event

A live 30-minute expert session on Safety-Rated Speed Monitoring and Drive-Integrated Functions (STO, SS1, SLS) (ISO 13849 — Machinery Safety). What We'll Cover: What drive-integrated safety functions are and where STO/SS1/SLS selection sits in safety function specification The integration method step by step: choosing the stop function, encoder sizing for SLS, and wiring versus network activation How IEC 61800-5-2 declared data maps into ISO 13849 subsystems and the drive parameterization record produced Common mistakes: claiming SS1 timing without verifying ramp monitoring and ignoring the encoder in the PL calculation The drive safety parameter checksum and commissioning test evidence an auditor expects for each configured function Related topics: sto · ss1 · sls · iec 61800-5-2 · safe

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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.
Risk reduction allocation
Distributing required risk reduction among mechanical design, safeguards, control functions and procedures.
Random vs systematic
Hardware wear-out/chance failures quantified statistically versus design/process errors controlled by rigor.
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.