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© ABB
| Slide 34
Functional Testing
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Not ALL System Faults are Self-Revealing
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Covert Faults that may inhibit SIS action on Demand can
only be detected by testing the entire system
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Periodical Functional Tests shall use a documented
procedure to Detect Covert Faults
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The entire SIS shall be tested
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Functional Testing should Record and Analyze activation of
SIS functions
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Spurious activation of an ESV due to a PSD, does not test
the Entire Function of the same valve during an ESD action
Nov 04, 2014