Risk Reduction; Residual Risk; Ec Declaration Of Conformity - Siemens SINAMICS S120 Function Manual

10.2.8

Risk reduction

Risk reduction measures for a machine can be implemented by means of safety-related
control functions in addition to structural measures. To implement these control functions,
special requirements must be taken into account, graded according to the magnitude of the
risk. These are described in EN ISO 13849-1 or, in the case of electrical controllers
(particularly programmable electronics), in EN 61508 or EN 62061. The requirements
regarding safety-related controller components are graded according to the magnitude of the
risk and the level to which the risk needs to be reduced.
EN ISO 13849-1 defines a risk flow chart that instead of categories results in hierarchically
graduated Performance Levels (PL).
IEC/EN 62061 uses "Safety Integrity Level" (SIL) for classification purposes. This is a
quantified measure of the safety-related performance of a controller. The required SIL is also
determined in accordance with the risk assessment principle according to ISO 12100 (EN
1050). Annex A of the standard describes a method for determining the required Safety
Integrity Level (SIL).
Regardless of which standard is applied, steps must be taken to ensure that all the machine
controller components required for executing the safety-related functions fulfill these
requirements.
10.2.9

Residual risk

In today's technologically advanced world, the concept of safety is relative. The ability to
ensure safety to the extent that risk is ruled out in all circumstances – "zero-risk guarantee" –
is practically impossible. The residual risk is the risk that remains once all the relevant
protective measures have been implemented in accordance with the latest state of the art.
Residual risks must be clearly referred to in the machine/plant documentation (user
information according to EN ISO 12100).
10.2.10

EC declaration of conformity

The EC Declaration of Conformity for the product can be obtained from your local Siemens
office or in the Internet at:
EC declaration of conformity
(https://support.industry.siemens.com/cs/ww/en/view/67385845)
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Standards and regulations
10.2 Safety of machinery in Europe
397