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Functional
Safety, Introduction Reliability vs. Safety → IEC 61508 ISO 13849 IEC 61508 vs. ISO 13849 Summary |
IEC
61508 plays a vital role in functional safety. IEC 61508 applies
for suppliers, manufacturers and distributors of safety related
systems. Safety certificates are a popular means for demonstrating
compliance with safety standards, |
Standard |
Description |
IEC 61508 |
Umbrella standard. Applies automatically if no industry-specific standard exists, or if no specific safety related standard is required. |
IEC 61511 |
Modified IEC 61508 for plant
manufacturers and process industry. More pragmatic, e.g. allows poor component quality to be compensated with redundancy. |
ISO 13849 | Relatively small standard.
Applicable for all industries. "Safety of machinery - safety-related parts of control systems" Very popular standard due to its compactness while still addressing all basic safety aspects. Easy to apply. Special feature: Two key performance indices (instead of one): Category and Performance Level. |
EN
50128 and EN 50129 |
Railway
specific standards for hardware and software. |
ISO 25119 |
Simplified but more specific
variant of ISO 13849 (see above). Tied to the needs of agricultural
machinery. |
ISO 26262 |
Automobile
standard. Similar to IEC 61508 at first glance, but a closer look
reveals huge differences. ISO 26262 uses Automotive SIL (ASIL) instead
of SIL (IEC 61508). |