EJ2918
EJ19xx and EJ29xx
38
Version: 1.2.0
10.4
Safety parameters
Characteristic numbers
EJ2918
Lifetime [a]
20
Proof test interval [a]
not required
1)
PFH
D
3.03E-09
%SIL3 of PFH
D
3.0%
PFD
avg
2.6E-05
%SIL3 of PFD
avg
2.6%
MTTF
D
1994 a
DC
98.1% (CAT 4)
Performance Level
PL e
Category
4
HFT
1
Classification element
2)
Type B
1. Special proof tests are not required during the entire service life of the EJ2918 EtherCAT module.
2. Classification according to IEC 61508-2:2010 (see chapters 7.4.4.1.2 and 7.4.4.1.3)
The EJ2918 EtherCAT module can be used for fail-safe applications within the meaning of IEC 62061 and
IEC 61508:2010 up to SIL3 and EN ISO 13849-1:2015 up to PL e (Cat4).
Further information on calculating or estimating the MTTF
D
value from the PFH
D
value can be found in the
TwinSAFE application manual or in EN ISO 13849-1:2015, Table K.1.
In terms of safety-related parameters, the Safety-over-EtherCAT communication is already considered with
1% of SIL3 according to the protocol specification.
