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

2.2.9

Risk analysis/assessment

Systems and machines represent risks due to their design and functionality. For this reason,
the Machinery Directive requires that a risk assessment be performed for each machine and,
if necessary, the level of risk reduced until the residual risk is less than the tolerable risk. To
assess these risks, the following standard must be applied:
● DIN EN ISO 12100 "Safety of machinery - General principles for design - Risk assessment
and risk reduction"
● DIN EN ISO 13849-1 "Safe control of machinery - Safety-related parts of control systems"
EN ISO 12100 mainly describes the risks to be considered and the design principles to
minimize risks - as well as the iterative process when assessing and reducing risks to achieve
the appropriate degree of safety.
Risk assessment is a procedure that allows hazards resulting from machines to be
systematically investigated. Where necessary, the risk assessment is followed by a risk
reduction procedure. When this procedure is repeated, an iterative process is obtained (see
Fig. ), which can then be used to eliminate hazards as far as possible and so that the
appropriate protective measures can be taken.
Risk assessment encompasses the following
● Risk analysis
a) Determining the machine limits
b) Identifying hazards
c) Techniques to estimate risk
● Risk evaluation
As part of the iterative process to achieve the appropriate degree of safety, after the risk has
been analyzed the risk is assessed. A decision must then be made as to whether the residual
risk needs to be reduced. If the risk is to be further reduced, suitable protective measures must
be selected and applied. The risk assessment must then be repeated.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Regulations and standards
2.2 Machine safety in Europe
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