2TLC172316M0201, rev E
13
www.abb.com/ jokabsafety
2015-09-30
10 Functional Safety Data
Functional Safety Data BT50(T)
Parameters acc. to IEC 61508
Values
Device type
A
Mode of operation
Low Demand Mode or High Demand Mode
HFT
1
SIL
3
Safety function
Output relays in OFF state when input is de-energized
λ
s
7562.2 FIT
λ
dd
0 FIT
λ
du
=
λ
d
576 FIT
λ
tot
8138.2 FIT
SFF
93%
MTTF
d
9337 years
PFH
1.22 x 10
-8
1/h
PFD
avg
for T
proof
= 1 year
5.25 x 10
-5
PFD
avg
for T
proof
= 2 years
1.09 x 10
-4
Response time at deactivation
< 20 ms
Life Time
20 years
The function of the devices has to be checked within the proof test interval (T
proof
).
