Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 360

02.12
05.01
Determining DC
Table 9-8
DC (channel 1)
DC (channel 2)
DC
Determining the
Performance Level
S
S
S
S
Acc. to EN ISO 13849–1:2008 Annex K, PLe with PFHd = 4.29 x 10–8 / h is
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.
Table 9-9 Measures according to EN ISO 13849–1 to attain SRP/CS from Category 2 and higher
Physical separation between the signal paths:
S
Separate wiring in the control cabinet
S
Sufficient creepages and clearances on printed circuits
Protection against overvoltage, overcurrent
Using well–proven components
Diversity regarding the technology is applied as a result of the internal structure of the elements to evaluate
and respond.
The requirements regarding sensitivity to all of the relevant ambient conditions, such as temperature, shock,
vibration, humidity (for example as defined in the applicable standards) have been taken into account.
The design engineers have been trained to identify the reasons and effects of failures as a result of common
causes.
Total
In total, the adequate number of 65 points is reached.
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Determining the diagnostic coverage level (DC)
Parameter Value
90 %
90 %
90 % → average
avg
Structure of the SRP/CS corresponding to Category 3
MTTF is high
d
DC is average
avg
sufficient measures against common cause failures
Measure
9 Cabinet Design and EMC
9.4 Application examples
Comment
Testing –K1 in the feedback circuit of –A1
Testing –K2 in the feedback circuit of –A1
DC = DC (channel 1) = DC (channel 2)
avg
9
Points
15
15
5
20
10
5
70
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