Siemens SINAMICS S110 - EN ISO 13849-1 (Previously en 954-1)

Safety Integrated Functions
8.1 Standards and regulations
Function Manual
322 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Systems for executing safety-related control
functions
EN ISO 13849-1 EN 62061
A Non-electrical (e.g. hydraulic, pneumatic) X Not covered
B Electromechanical (e.g. relay and/or basic
electronics)
Restricted to the designated
architectures (see comment 1)
and max. up to PL = e
All architectures and max. up to
SIL 3
C Complex electronics (e.g. programmable
electronics)
Restricted to the designated
architectures (see comment 1)
and max. up to PL = d
All architectures and max. up to
SIL 3
D A standards combined with B standards Restricted to the designated
architectures (see comment 1)
and max. up to PL = e
X
See comment 3
E C standards combined with B standards Restricted to the designated
architectures (see comment 1)
and max. up to PL = d
All architectures and max.
up to SIL 3
F C standards combined with A standards
or
C standards combined with A standards and B
standards
X
See comment 2
X
See comment 3
"X" indicates that the point is covered by this standard.
Comment 1:
Designated architectures are described in Annex B of EN ISO 13849-1 and provide a simplified basis for the quantification.
Comment 2:
For complex electronics: Using designated architectures in compliance with EN ISO 13849-1 up to PL = d or every
architecture in compliance with EN 62061.
Comment 3: For non-electrical systems: Use components that comply with EN ISO 13849-1 as sub-systems.
8.1.2.4 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 results in the probabilistic basis in EN ISO
13849-1 (probability of failure per unit time).
EN ISO 13849-1 is based on the known categories of EN 954-1. It now also takes into
account complete safety functions and all the devices required to execute these. With EN
ISO 13849-1, safety functions are investigated from a quantitative perspective going beyond
the qualitative basis of EN 954-1. 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
d
: Mean time to dangerous failure
● DC: Diagnostic coverage
● CCF: Common cause failure