244 Safe torque off function
Safety data
The safety data for the Safe torque off function is given below.
Note: The safety data is calculated for redundant use, and does not apply if both STO
channels are not used.
• The following temperature profile is used in safety value calculations:
• 670 on/off cycles per year with T = 71.66 °C
• 1340 on/off cycles per year with T = 61.66 °C
• 30 on/off cycles per year with T = 10.0 °C
• 32 °C board temperature at 2.0% of time
• 60 °C board temperature at 1.5% of time
• 85 °C board temperature at 2.3% of time.
Frame
size
IEC 61508 and IEC/EN 61800-5-2
SIL PFH
(1/h)
PFD
avg
(T
1
= 2 a)
HFT SFF
(%)
Lifetime
(a)
R1 3 2.54E-09 2.23E-05 1 >99 20
R2 3 2.54E-09 2.23E-05 1 >99 20
R3 3 2.54E-09 2.23E-05 1 >99 20
R4 3 2.54E-09 2.23E-05 1 >99 20
R5 3 2.54E-09 2.23E-05 1 >99 20
R6 31.01E-099.26E-061 >99 20
R7 3 1.01E-09 9.26E-06 1 >99 20
R8 3 1.18E-09 1.08E-05 1 >99 20
R9 3 1.18E-09 1.08E-05 1 >99 20
Frame
size
EN ISO 13849-1 IEC/EN
62061
IEC 61511
PL CCF
(%)
MTTF
D
1
(a)
DC
2
(%)
Category SILCL SIL
R1 e 80 2938 ≥90 3 3 3
R2 e 80 2938 ≥90 3 3 3
R3 e 80 2935 ≥90 3 3 3
R4 e 80 2932 ≥90 3 3 3
R5 e 80 2934 ≥90 3 3 3
R6e8010876≥90 3 3 3
R7 e 80 10876 ≥90 3 3 3
R8 e 80 2489 ≥90 3 3 3
R9 e 80 2489 ≥90 3 3 3
1
100 years must be used for calculation of a safety loop. 3AXD00000586715.xls J
2
According to standard EN ISO 13849-1 table E.1
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