BS EN 61508-6:2002 - Page 3

BS EN 61508-6:2002 contains information and guidelines on IEC 61508-2 and IEC 61508-3.

• Annex A gives a brief overview of the requirements of IEC 61508-2 and IEC 61508-3 and sets out the functional steps in their application.
• Annex B gives an example technique for calculating the probabilities of hardware failure and should be read in conjunction with 7.4.3 and annex C of IEC 61508-2 and annex D.
• Annex C gives a worked example of calculating diagnostic coverage and should be read in conjunction with annex C of IEC 61508-2.
• Annex D gives a methodology for quantifying the effect of hardware-related common cause failures on the probability of failure.
• Annex E gives worked examples of the application of the software safety integrity tables specified in annex A of IEC 61508-3 for safety integrity levels 2 and 3.