adequately with technical uncertainties
& Quality Management
Safety vs. Reliability
IEC 61508 vs. ISO 13849
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:
- 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
- Universally applicable (2). In contrast to IEC 61508,
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
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.
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.
- ISO 25119 (functional safety standard for agricultural
machines) also uses Category and performance level.
Like IEC 61508, ISO 13849 plays a key role
among safety standards, although being much less comprehensive.