Appendix 1: Possibilities To Reveal Dangerous Undetected Faults During The Proof Test - turck IM1-12-R Handbuch

Appendix 1: Possibilities to reveal dangerous undetected faults during the
proof test
According to section 7.4.3.2.2 f) of IEC 61508-2 proof tests shall be undertaken to reveal
dangerous faults which are undetected by diagnostic tests.
This means that it is necessary to specify how dangerous undetected faults which have been
noted during the FMEDA can be detected during proof testing.
Table 8, Table 9 and Table 10 show an importance analysis of the most critical dangerous
undetected faults and indicate how these faults can be detected during proof testing.
Appendix 1 shall be considered when writing the safety manual as it contains important safety
related information.
Table 8: Importance Analysis of dangerous undetected faults of MK13-R-Ex0
Component
IC3
K1
T101
IC1
D101
C101
X4
R101
© exida.com GmbH
Stephan Aschenbrenner
more@turck.com • www.turck.com • 2015/04
Anhang – EXIDA-Report FMEDA Turck 04/07-14 R002
% of total λ
du
60,90%
22,78%
10,03%
4,10%
0,91%
0,91%
0,18%
0,18%
Detection through
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
100% functional test with monitoring of the
expected output signal
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