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Do Control Systems That Place Demands On A Safety-Related System Have To Be Themselves Designated As Safety-Related Systems?


7.5.2.4 of IEC 61508-1 gives the requirements that apply for the control system not to be designated as a safety-related system. In summary, these are:
  • allowing for a dangerous failure rate of the control system higher than the maximum defined by the standard for a safety-related system (ie higher than 10-5 dangerous failures per hour);
  • providing an adequate demonstration that the dangerous failure rate allowed for is achieved (7.5.2.4 of IEC 61508-1 contains further details);
  • determining all reasonably foreseeable dangerous failure modes of the control system;
  • ensuring that the control system is separate and independent from all safety-related systems.
This text contains extracts from the IEC Functional Safety Zone. All such extracts are copyright of International Electrotechnical Commission © 2005, IEC, Geneva, Switzerland. All rights reserved. IEC has no responsibility for the placement and context in which the extracts are reproduced. This notice takes precedence over any general copyright statement.

 

 




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Created 2008-11-10
Modified 2008-11-10
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