En Iso 13849-1 (Previously En 954-1) - Siemens SINAMICS G120 Function Manual

Appendix
A.1 Standards and regulations
D A standards combined with B standards
E C standards combined with B standards
F C standards combined with A standards
or
C standards combined with A standards and B
standards
"X" indicates that the point is covered by this standard.
Comment 1:
Designated architectures are described in Annex B of EN ISO 13849-1:2006 and provide a simplified basis for
quantification.
Comment 2:
For complex electronics: Use designated architectures in compliance with EN ISO 13849-1:2006 up to PL = d or every
architecture in compliance with EN 62061
Comment 3:
For non-electrical systems: Use parts that comply with EN ISO 13849-1:2006 as sub-systems.
A.1.2.4

EN ISO 13849-1 (previously EN 954-1)

A qualitative analysis (to EN 954-1) is not sufficient for modern controllers due to their
technology. Among other things, EN 954-1 does not take into account time behavior (e.g.
test interval and/or cyclic test, lifetime). This led to the probability-based approach of EN ISO
13849-1:2006 (probability of failure per time unit).
EN ISO 13849-1:2006 is based on the familiar categories used in EN 954-1. It now also
takes into account complete safety functions and all the devices required to execute these.
In addition to the qualitative approach of EN 954-1, EN ISO 13849-1:2006 now includes a
quantitative analysis of the safety functions. Performance levels (PL), which are based on
the 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:
The standard describes how the performance level (PL) is calculated for safety-related
components of the controller on the basis of designated architectures. In the event of any
deviations from this, EN ISO 13849-1:2006 refers to EN 61508.
When combining several safety-related parts to form a complete system, the Standard
explains how to determine the resulting PL.
158
: Mean time to dangerous failure
d
Common cause failure
Restricted to the designated
architectures (see comment 1)
and max. up to PL = e
Restricted to the designated
architectures (see comment 1)
and max. up to PL = d
X
See comment 2
Safety Integrated Function Manual, SINAMICS G120
Function Manual, 07/2010, FW 4.3.2, A5E03052391B AA
X
See comment 3
All architectures and max.
up to SIL 3
X
See comment 3