IEC TR 62061-1:2010
[Withdrawn]
Guidance on the application of ISO 13849-1 and IEC 62061 in the design of safety-related control systems for machinery
...After this time B2 shall be replaced if a mission time of 20
years is intended for the whole SRP/CS...
...ssumed to be dangerous, the B
10d
value is produced by doubling of the B
10
value:
10d
d,Q1/Q2
op
2 000000cycles
MTTF 571y
cycles
0,1
0,1 35040
y
B
n
== =
10d
10d,Q1/ Q2
op
2000000cycles
57,1y
cycles
35040
y
B
T
n
== =
For both channels the M...
...In accordance with
ISO 13849-1 the MTTF
d
of both channels is limited to 100 years and, in this case, as the
MTTF
d
of both channels are equal after limiting it is not necessary to perform symmetrization...