Din En Iso 13849-1 - Siemens SINAMICS S120 Function Manual

Standards and regulations
10.2 Safety of machinery in Europe
10.2.4

DIN EN ISO 13849-1

A qualitative analysis according to DIN EN 13849-1 is not sufficient for modern control
systems due to their technology. Among other things, DIN EN ISO 13849-1 does not take
into account time behavior (e.g. test interval and/or cyclic test, lifetime). This results in the
probabilistic approach in DIN EN ISO 13849-1 (probability of failure per unit time).
DIN EN ISO 13849-1 considers complete safety functions and all the devices required to
execute these. With DIN EN ISO 13849-1, safety functions are considered from both a
qualitative as well as a quantitative perspective. Performance levels (PL), which are based
on specific categories, are used. The following safety-related characteristic quantities are
required for devices/equipment:
● Category (structural requirement)
● PL: Performance level
● MTTF
● DC: Diagnostic coverage
● CCF:
Common cause failure
The standard describes how the performance level (PL) is calculated for safety-related
components of the controller on the basis of designated architectures. For deviations from
this, DIN EN ISO 13849-1 refers to IEC 61508.
When combining several safety-related parts to form a complete system, the standard
explains how to determine the resulting PL.
Note
DIN EN ISO 13849-1 and machinery directive
Since May 2007, DIN EN ISO 13849-1 has been harmonized as part of the Machinery
Directive.
392
: Mean time to dangerous failure
d
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated