Siemens Simodrive 611 Configuration Manual page 368

02.12
05.01
Determining DC
Table 9-14
DC (channel 1)
DC (channe 2)
DC
Determining the
Performance Level
S
S
S
S
Acc. to EN ISO 13849–1:2008 Annex K PLe mit PFH
attained.
Measures against common cause failures CCF of the
safety function
According to EN ISO 13849–1 Annex F, for SRP/CS from Category 2, a mini-
mum of 65 points is required.
The considerations according to Chapter 9.4.1 Table 9-9.
This means that in total, the adequate number of 65 points is reached.
Checking the PFH value of the complete safety func-
tion
Table 9-15
SENSE
EVALUATE
RESPOND
Total
As a consequence, the requirements regarding PLd with Category 3 for the pro-
tective door safety function are fulfilled.
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Determining the diagnostic coverage level (DC)
Parameter Value
99 % Testing –K1 via –K3 in the feedback circuit of –A2, as
well as –K6 at –A3 each time the protective door is clo-
sed.
90 % Testing –K2 and –K3 in the feedback circuit of –A1
when EMERGENCY STOP is requested.
Undetected accumulation of faults is possible between
the requests.
Testing –K4 in the feedback circuit of –A2 each time the
protective door is closed.
94,50 %
avg
→ avergage
DCavg =
Structure of the SRP/CS corresponding to Category 3
MTTF is high
d
DC is average
avg
sufficient measures against common cause failures
PFH value of the complete safety function
Parameter PFH value
-8
2,47 x 10 / h
-11
2 x 5,4 x 10
-8
4,29 x 10 / h
-8
8,59 x 10 / h
9 Cabinet Design and EMC
9.4 Application examples
Comment
DC
1
+
MTTF (channel 1) MTTF
d
1
+
MTTF (channel 1) MTTF
d
= 4,29 x 10
d
PL Comment
e Position switches –S4 and –S5
/ h e Safety relays –A2 and –A3
e Switching elements –K1, –K2, –K3,
–K4, –K5 and –K6
-6
e <1 x 10 / h
DC
2
(channel 2)
d
1
(channel 2)
d
-8
/ h is
9-367
9