ABB FSO-12, User Manual

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378 Technical data

Basic safety data
The FSO-12 module is a type B safety component as defined in IEC 61508-2.
The FSO-12 data related to safety standards IEC 61508, EN/IEC 61800-5-2,
EN ISO 13849-1 and EN/IEC 62061 is listed below for the different subsystems
within the FSO module.
Maximum useful mission time ( T
m
) for the FSO module module is 20 years. After 20
years, the module has to be replaced.
The given safety data applies with proof test interval T1 = 20 years (high demand and
continuous mode of operation) and T1 = 2 years or T1 = 5 years (low demand mode
of operation). Make sure that the proof test is performed within this time (see also
section
Proof tests on page 369 ).
EN 61508 EN ISO 13849-1 EN/IEC 62061
SIL up to 3 PL up to e SILCL 3
SC 3
3AXD10000006135.xlsm L
PROFI-
safe
1)
1-ch. DI,
pulses
2-ch. DI,
pulses
1-ch. DI,
no pulses
2-ch. DI,
no pulses
Logic 1,
1-ch. DI or
DO, no
pulses
2)
Logic 2,
other
cases
2)
SIL/SILCL 3 3 3 2 3 1 3
PL e d e c e c e
PFH (1/h) 1.0E-09 5.1E-10 1.8E-12 9.0E-09 2.3E-12 4.5E-09 4.4E-11
PFD
avg
(T1 = 2 a)
8.8E-06 4.8E-06 2.4E-08 7.9E-05 2.8E-08 5.2E-05 4.1E-07
PFD
avg
(T1 = 5 a)
2.2E-05 1.2-E5 4.8E-08 2.0E-04 5.8E-08 1.3E-04 9.9E-07
MTTF
D
(a) 114155 17844 12648 12648 12648 5048 5048
HFT N/A 0 1 0 1 0 1
Cat. 4 2 3 1 3 1 3
SFF (%) 99.00 99.64 99.94 94.02 99.92 86.82 93.48
DC (%) 99.00 91.99 99.00 0.00 98.74 80.26 90.23
3AXD10000006135.xlsm L
1)
We assume conservatively that PFH = λ d = 1, FIT = 1e-9 1/h,
MTTF
D
= 1/ λ d = 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.
2)
Either logic subsystem (Logic 1 or Logic 2) is included in each safety function implemented
with the FSO. If the safety function contains any 1-channel digital input or output of the FSO
with non-pulsed signals, the subsystem "Logic 1” must be used. Otherwise the subsystem
"Logic 2" is used.