Functional safety
FUNCTIONAL SAFETY
Technical data of the safety functions
9.
Ref.1912
· 321 ·
DDS
HARDWARE
9.7 Technical data of the safety functions
To calculate the machine's Performance Level (PL of EN ISO 13849-1)
and/or
Safety Integrated Level (SIL of IEC 62061), use the drive data
provided in the following tables:
High demand
The safety functions of the drive have been designed to be used in high
demand mode (at least once a year) according with regulation IEC 61800-5-
2.
T. H9/1 Calculation data according to EN ISO 13849-1.
T
M (Mission Time of the drive)
1
years 20
PL (
Performance Level) d
STO
MTTFd (Mean Time To dangerous Failure) years 247
DCavg (Average
Diagnostic Coverage) %
90
CCF (score of measures against
Common
Cause Failure)
80
B
10d
(average number of cycles until 10% of
the components suffers a dangerous failure)
cycles 10 000 000
Category 3
1
See Mission times in 9.11 Maintenance, repair and analysis of hazardous
events
.
T. H9/2 Calculation data according to IEC 61508 and IEC 61800-5-2.
T
M (Mission Time of the drive)
1
years 20
STO
SFF (Safe Failure Fraction) % 94
PFH (
Probability of Failure per Hour) 1/h 1,3 E-09
DU (Dangerous Undetected failures) 1/h 4,6 E-08
HFT (
Hardware Fault Tolerance) 1
SIL (
Safety Integrity Level) 2
1
See Mission times in 9.11 Maintenance, repair and analysis of hazardous
events
.
note 1
The SFF, PFH, MTTFd and DCavg data for STO are calculated
considering a - KM1 contactor with B10d = 1 300 000 life cycles and
demand of the STO safety function every 10 minutes
, running 24 hours
a day.
note 2
See
Probabilities of dangerous failure. PFH and MTTFd in 9.11
Maintenance, repair and analysis of hazardous events
.
note 3
The external main contactor - KM1 installed must comply with standard
IEC 60947-4-1 (if it is a mirror-contact type) or with IEC 60947-5-1 (if its
contact is joined mechanically).
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