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iec 62061

2 articles tagged “iec 62061”.

IEC 62061 PFHd calculation block diagram showing sensor, logic solver and actuator with probability of dangerous failure per hour values
functional safetyiec 62061pfhd

IEC 62061 PFHd Calculation: A Step-by-Step Guide

PFHd is the number that decides whether your safety function hits SIL 2. Here is how to calculate it correctly under IEC 62061, with a real worked example.

Jun 27, 2026 · 8 min read

IEC 62061 SIL levels diagram showing SIL 1 2 and 3 probability of failure bands for machinery safety functions
functional safetyiec 62061sil

IEC 62061 SIL Levels: What They Actually Mean

IEC 62061 SIL levels define how reliable your safety function must be. Here's what SIL 1, 2 and 3 really mean, how PFH is calculated, and common mistakes to avoid.

Jun 27, 2026 · 8 min read

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