MEDC DB4 Technisches Handbuch Seite 8

Architectural constraints:
Random hardware failures:
Probability of failure on demand:
Probability of Dangerous failure on safety function:
Hardware safety integrity compliance
Systematic safety integrity compliance
Systematic Capability
Overall SIL-capability achieved
10/11
Downloaded from www.Manualslib.com
Proven in Use Summary Table
Safety Function of the DB4 Speaker:
To provide an audible warning sound when required'
manuals search engine
DB4 SPEAKER
Type A Proof Test Interval
HFT=0 =8760Hrs
SFF = 85.00% MTTR = 8 Hrs
= 0
λ
DD
= 4.70E-07
λ
DU
PFD =2.06E-03
AVG
(Low Demand Mode)
PFH = 4.70E-07
(High Demand Mode)
SIL 2 (Low Demand)
SIL 2 (High Demand)
SIL2
= 0
λ
SD
= 2.86E-06
λ
SU
SIL2
SIL2
Route 1
H
Route 1
S
SC2
© Cooper MEDC 2011