E2S GNExB1X05, Instruction Manual, Page: 5 / 12

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European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH www.e2s.com Tel: +44 (0)208 743 8880
Document No. D155-00-201-IS Issue 3 28-11-22 Sheet 5 of 5
1SIL 2 Reliability Data
Reliability and Functional safety IEC/EN61508 which has
been assessed and is considered suitable for use in low
demand safety function:
1. Random Hardware Failures and Architectural constraints
(route
2
H
).
2. As an unvoted item (i.e. hardware fault tolerance of 0) at
SIL 2.
The product was assessed against failure modes:

Failure respond to an input by lighting a beacon.

Spurious light output despite no input.
3. When employing the device in a SIL2 compliant system
the user should ensure frequent or continuous automatic
monitoring of continuity.
Integrity in respect of failure to
function
SIL2
& SIL1
Total Failure rate
0.
48
pmh
“Hazardous” failure rate (revealed) 0
pmh
“Hazardous” failure rate (unrevealed)
0.
48
pmh
“Safe” failure rate (revealed) 0 pmh
“Safe” failure rate (unrevealed) 0
System type B
Hardware Fault Tolerance 0
Diagnostic Coverage
>
60
%
PFD (hazardous failure) 2.1
x 10 -
3
Proof Test Interval Up to 1 year