Twinsafe Safe Motion Functions With External Encoder; Environmental Conditions - Beckhoff AX8911 Operating Manual

Technical data
Safety parameters
Element classification
For further information, please refer to the chapter Service life [} 25].
5.2.3

TwinSAFE Safe Motion functions with external encoder

In terms of safety-related parameters, the FSoE communication is considered with 1 % of SIL 3 according to
the protocol specification.
Safety parameters
Lifetime
Prooftest interval
PFH
D
PFD
avg
MTTF
D
DC
SFF
SIL
Performance Level
CAT
HFT
Element classification
1
The proof tests in Low Demand mode must be executed according to the key figure (results in approx. 1
year).
For further information, please refer to the chapter Service life [} 25].
5.3

Environmental conditions

Beckhoff products are designed for operation under certain environmental conditions, which vary according
to the product. The following specifications must be observed for operation and environment in order to
achieve the optimum service life of the products as well as to ensure product safety.
Do not use TwinSAFE drive option cards under the following operating conditions:
• under the influence of ionizing radiation (exceeding the natural background radiation)
• in corrosive environments
• in an environment that would lead to impermissible contamination of the TwinSAFE drive option card
The environmental conditions of this TwinSAFE drive option card are defined by its installation in the overall
system. For the conditions, refer to the "Data for operation and environment" in document [2] at References
[} 7].
22
Type B
20 a
Not necessary in High Demand mode.
Proof tests within the service life are
necessary in Low Demand mode.
4.8E-9
2.2E-4
high
high, 99.4%
>99%
3
e
4
1
Type B
WARNING
Version: 2.0.0
Explanation
According to EN 61508-2:2010.
Explanation
1
According to IEC 61508:2010.
According to EN ISO 13849-1:2015.
According to EN ISO 13849-1:2015.
According to EN 61508-2:2010.
AX8911