Functional safety
9.
FUNCTIONAL SAFETY
Technical Data of the Safety Functions
· 314 ·
320
Ref.2003
QC-PDS
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.
TM (
M
ission
T
ime of the drive)
1
years
20
PL (
P
erformance
L
evel)
d
STO
MTTFd (
M
ean
T
ime
T
o
d
angerous
F
ailure) years
4427
DCavg (Average
D
iagnostic
C
overage) %
90
CCF (score of measures against
C
ommon
C
ause
F
ailure)
70
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.
TM (
M
ission
T
ime of the drive)
1
years 20
STO
SFF (
S
afe
F
ailure
F
raction) %
92.5
PFH (
P
robability of
F
ailure per
H
our) 1/h
1.25 E-10
DU (
D
angerous
U
ndetected failures) 1/h 2.6 E-09
HFT (
H
ardware
F
ault
T
olerance)
1
SIL (
S
afety
I
ntegrity
L
evel)
2
·1·
See
MISSION TIMES
in
9.11 MAINTENANCE, REPAIR AND ANALYSIS OF HAZARDOUS
EVENTS
.
NOTE 1
n
op ·mean number of annual operations· used to calculate the PFH of
STO.
The SFF, PFH, MTTFd and DCavg for STO data is calculated
considering a demand of the STO safety function every 5 minutes
running 24 hours a day.
For higher demands, check with Fagor Automation.
NOTE 2
See PROBABILITIES OF DANGEROUS FAILURE. PFH AND MTTFD in 9.11
MAINTENANCE, REPAIR AND ANALYSIS OF HAZARDOUS EVENTS.
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