# Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast) (Text with EEA relevance), Division 1.2.1: Safety and reliability of control systems

Extent: E+W+S+N.I.

Control systems must be designed and constructed in such a way as to prevent hazardous situations from arising. Above all, they must be designed and constructed in such a way that:
they can withstand the intended operating stresses and external influences,
a fault in the hardware or the software of the control system does not lead to hazardous situations,
errors in the control system logic do not lead to hazardous situations,
reasonably foreseeable human error during operation does not lead to hazardous situations.
Particular attention must be given to the following points:
the machinery must not start unexpectedly,
the parameters of the machinery must not change in an uncontrolled way, where such change may lead to hazardous situations,
the machinery must not be prevented from stopping if the stop command has already been given,
no moving part of the machinery or piece held by the machinery must fall or be ejected,
automatic or manual stopping of the moving parts, whatever they may be, must be unimpeded,
the protective devices must remain fully effective or give a stop command,
the safety-related parts of the control system must apply in a coherent way to the whole of an assembly of machinery and/or partly completed machinery.
For cable-less control, an automatic stop must be activated when correct control signals are not received, including loss of communication.

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Source: https://www.legislation.gov.uk/eudr/2006/42/annex/I/division/1/division/n5/division/1.2/division/1.2.1 (the official version)
Page: https://openlegislation.uk/eu-directive-2006-42/annex-I/division-1/division-n5/division-1.2/division-1.2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.