522 Technical data
Basic safety data
The FSO-21 module is a type B safety component as defined in IEC 61508-2.
The FSO-21 data related to safety standards IEC 61508, EN/IEC 61800-5-2,
EN ISO 13849-1, IEC 61511, and EN/IEC 62061 is listed below for the different
subsystems within the FSO module.
The maximum useful mission time (T
m
) for the FSO module is 20 years. After 20
years, the module must be replaced.
The given safety data is applicable with these proof test intervals:
• T1 = 20 years (high demand and continuous mode of operation)
• T1 = 2, 5, or 20 years (low demand mode of operation).
Make sure that the proof test is performed within this time (see also section Proof
tests on page 512).
EN/IEC 61508 EN ISO 13849-1 EN/IEC 62061
SIL up to 3 PL up to e SIL 3
3AXD10001287182 C
1-ch. DI,
pulses
2-ch. DI,
pulses
1-ch. DI,
no pulses
2-ch. DI,
no pulses
Logic PROFI-
safe
1)
SIL 332333
PL deceee
PFH (1/h)
(T1 = 20 a)
1.1E-10 5.5E-12 1.1E-08 2.9E-11 1.1E-11 1.0E-09
PFD
avg
(T1 = 2 a)
5.8E-08 5.9E-08 5.7E-06 6.7E-07 9.9E-08 8.8E-06
PFD
avg
(T1 = 5 a)
1.4E-07 1.5E-07 1.4E-05 1.7E-06 2.5E-07 2.2E-05
PFD
avg
(T1 = 20 a)
5.8E-07 5.9E-07 5.8E-05 6.7E-06 9.9E-07 8.8E-05
MTTF
D
(a) 10747 10431 10628 10738 11290 114155
HFT 01011 -
Cat. 231334
SFF (%) 99.7 99.7 73.5 98.6 99.0 99.0
DC (%) 99.0 99.0 1.4 94.6 96.7 99.0
3AXD10001287182 C
1) We assume conservatively that PFH = λd = 1, FIT = 1e-9 1/h,
MTTF
D
= 1/λd = 1/(1e-9 1/h) = 1e9 h = 114155 a. Based on the BGIA Report 2/2008e: Functional Safety of
Machine Controls – Application of EN ISO 13849, ch. 6.2.17.
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