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Appendix: Proof Test
9 Appendix: Proof Test
Proof tests shall be undertaken to reveal dangerous faults that are undected by diagnostic tests.
This means that it is necessary to specify how dangerous undetected faults which have been
previously noted during the FMEDA can be detected during proof testing.
Ensure that the proof test is only carried out by qualified personnel.
A suggested proof test consists of the following steps:
Step Action
1. Bypass the safety functions and take appropriate action to avoid a false trip.
2.
Provide appropriate input-/control signals to the interface modules and verify the expected
signal input/output conditions for the interfaces.
3. Verify if internal fault detection is working in case it is activated.
4. Provide appropriate input-/control signals to the interface modules and verify that the safety
function is carried out correctly.
5. Remove the bypass and otherwise restore normal operation.
This test will detect 95.5 % of possible dangerous undetected failures.
Once the test has been completed, document and archive the results.
10 Appendix: Document History
Document version Date Modifications
1.0 2020-04-07 Initial version