584 / 1143
15
Was the Inspector correct?
©ABBGroup
October23,2016|Slide29
§
Looking at the evidence on the certificate and report
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Yes
§
It’s really disappointing to see certification bodies issuing
certificates quoting end-user concepts
§
This was a ‘bad’ certificate
§
End user and design contractor thought they had
bough a SIL 2 solution
§
They wanted their money back
©ABBGroup
October23,2016|Slide30
Would IEC61511 Ed 2 change the decision?
§
Only one table in Ed 2
§
Seems to make HFT for SIL 2 easier
§
‘Flips’ the logic of Ed 1
IEC 61511-1 Ed 2 Table 3 – Minimum HFT requirements according to SIL
SIL
Minimum required HFT
1 (any mode)
0
2 (low demand mode)
0
2 (continuous mode)
1
3 (high demand or continuous mode)
1
4 (any mode)
2