Dealing adequately with technical uncertainties

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ISO 13849
  Functional Safety: Introduction
  Safety vs. Reliability
  IEC 61508
  ISO 13849
  IEC 61508 vs. ISO 13849
 
  Conclusions

ISO 13849 is a functional safety standard. Although being a derivative of the umbrella standard IEC 61508, ISO 13849 has some unique differentiators in comparison with IEC 61508 as well as with all other derivatives. This paragraph is a little on the short side because it explains only the differences.

Safety of Machinery - Safety-related parts of control systems

Key differentiators are:
  1. Universally applicable (1). ISO 13849 is applicable for all industries, as long as there are no industry specific standards. From all IEC 61508 derived standards, ISO 13849 is the only one with unrestricted applicability.
  2. Universally applicable (2). In contrast to IEC 61508, ISO 13849 covers not only electronics and software, but also pneumatics and hydraulics. By giving guidance on all system types (with the exception of mechanics), ISO 13849 facilitates its application for the safety analyst. 
  3. Two-dimensional classification of safety. While IEC 61508 uses only one key indicator (PFH or SIL), ISO 13849 has two: Category and performance level.See next paragraph for details.
  4. Ready to use. ISO 13849 can be conceived as easy to digest version of IEC 61508. ISO 13849 takes the safety analyst by the hand and guides him through the analysis process.
Like IEC 61508, ISO 13849 plays a key role among safety standards, although being much less comprehensive.
 
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