Risk Analysis/Assessment - Siemens SINUMERIK 840D sl Function Manual

03.06
1.2.7

Risk analysis/assessment

As a result of their very design and functionality, machines and plants represent
potential risks. This is the reason that the Machinery Directive specifies that a risk
assessment is carried-out for every machine and, where necessary, risks are then
reduced until the residual risk is less than the tolerable risk. For the techniques to
evaluate these risks, the following Standards should be applied:
S EN ISO 12100 "Safety of Machinery – basic terminology, general principles for
design" and
S EN 1050 "Safety of Machinery, general principles for assessing risk".
EN ISO 12100 mainly describes the risks to be considered and the design prin-
ciples to minimize risks; EN 1050 describes the iterative process when assessing
and reducing risks to achieve the appropriate degree of safety.
The risk assessment is a sequence of steps that allows hazards, as a result of ma-
chines, to be systematically investigated. Where necessary, a risk reduction proce-
dure follows risk assessment. When this procedure is repeated, an iterative pro-
cess is obtained (see Fig. 1-1), which can then be used to eliminate hazards as far
as possible and so that the appropriate protective measures can be taken.
The risk assessment involves the following
S Risk analysis
a) Determines the limits of the particular machine (EN ISO 12100, EN 1050
Para. 5)
b) Identifies the hazards (EN ISO 12100, EN 1050 Para. 6)
c) Techniques to estimate risk (EN 1050 Para. 7)
S Risk evaluation (EN 1050 Para. 8)
As part of the iterative process to achieve the appropriate degree of safety, after
the risk has been estimated, the risk is evaluated. In so doing, a decision must be
made as to whether the residual risk must be reduced. If the risk is to be further
reduced, suitable protective measures must be selected and also applied. The risk
assessment should then be repeated.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Regulations and Standards
1.2 Safety of machinery in Europe
1-25