Beckhoff AX8911, Документация

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Product description
AX8911 16 Version: 1.2.0
4.4 Safety parameters
Safety functions STO, SS1
Characteristic numbers AX8911 - STO, SS1
3)
(AX8xxx-x1xx and -x2xx)
Lifetime [a] 20
Proof test interval [a] not required
1)
PFH
D
4.70E-09
PFD
avg
2.20E-04
MTTF
D
high
DC high, 99.4%
SFF >99%
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 AX8911 TwinSAFE Drive Option
card.
2)
Classification according to IEC 61508-2:2010 (see chapters 7.4.4.1.2 and 7.4.4.1.3)
3)
SS1 corresponds to SS1-t ( safe stop 1 time controlled ) according to EN 61800-5-2:2017
The AX8911 TwinSAFE Drive Option Card with the safety functions STO and SS1 can be used for fail-safe
applications within the meaning of IEC 61508:2010 up SIL 3, EN 62061:2005/A1:2013/A2:2015 up to SILCL3
and EN ISO 13849-1:2015 up to PL e (Cat.4).
Further information on calculating or estimating the MTTF
D
value from the PFH
D
value can be found in the
TwinSAFE Application Guide 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.
SafeMotion functions with integrated encoder in Beckhoff motors (SICK EDS/EDM 35)
Characteristic numbers AX8911 - AX8xxx-x2xx with integrated encoder (SICK EDS/EDM 35)
Lifetime [a] 20
Proof test interval [a] not required
PFH
D
3.70E-07 (SIL2)
1) 3)
MTTF
D
17.5 y
DC medium, 94.32%
Performance level PL d
Category 3
Basis for safety functions Safe single-turn absolute position
Fail-safe resolution 13-bit
Fail-safe accuracy
2)
0.045°
1)
These data are related to a max. ambient temperature of 115 °C.
2)
The fail-safe accuracy indicates the maximum position error limit with which the safety functions can be
supported.
3)
The PFH
D
value is determined in accordance with the approximation formula from the manufacturer's data
for MTTF
D
and DC (see Application Guide).
When using the integrated encoder in Beckhoff motors, the SafeMotion functions can be used in fail-safe
applications within the meaning of IEC 61508:2010 up to SIL 2, EN 62061:2005/A1:2013/A2:2015 up to
SILCL2 and EN ISO 13849-1:2015 up to PL d (Cat.3).