Standards To Implement Safety-Related Programmable Electronic Controls - Siemens SINUMERIK 840D sl Function Manual

Regulations and Standards
1.2 Safety of machinery in Europe
1.2.3 Standards to implement safety-related programmable electronic
controls
If the functional safety of the machine depends on control functions, then the con-
trol must be implemented so that the probability of failure of the safety-related
functions is sufficiently low. This is the reason that Standard IEC 61508 must be
carefully observed when using programmable electronic systems. ISO 13849–1
and EN 954–1 and IEC 62061 provide instructions specifically addressing the sa-
fety of machine controls.
Any architectures,
all SIL 1
Safety of machinery
Functional safety, safety–
related electrical, electronic
and programmable electronic
sector standard IEC 62061 f
area of machines below
Universal use for electrical, electronic and programmable electronic
systems, that execute safety functions or guarantee functional safety
The areas of application of ISO 13849–1 and IEC 62061 are very similar. In order
to help users make a decision, the IEC and ISO associations have defined in detail
the application areas of both Standards in a common table in the introduction to
the Standards. Either prEN ISO 13849–1 (rev) or EN IEC 62061 is applied depen-
ding on the particular technology (mechanical, hydraulic, pneumatic, electrical,
electronic, programmable electronic), risk classification and architecture.
1-20
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
– 3 (from PL b)
IEC 62061
control systems
or the
IEC 61508
IEC 61508
Functional safety, safety–related electrical/electronic/
programmable electronic control systems
(part 1 to part 7)
Defined architectures, restricted
maximum PL for electronics
pr EN ISO 13849 (rev)
Safety of machinery
Safety–related parts of
controllers
For deviations from the
designated architectures
Reference to the IEC 61508
© Siemens AG, 2006. All rights reserved
03.06