Functional Safety 2014

iii) Wrong signal connected / tag

number discrepancy

Could have serious consequences

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But rarely actually the wrong signal connected

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Can apply to use of “soft tags” identified in Cause and Effects

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As-built corrections not captured in design documents – code reviews

reveal discrepancies between as-built documents and the software!

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Can result from design changes post FAT

Neil Wakeling, August 2014