User manual ADV200-…-SI with External Safety Modules
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6 SIL levels provided by safety functions
The ReeR modules used together with the Gefran AD200-xx-SI drives allow the implementation of the STO,
SS1, SDI and SLS safety functions as described in Paragraph §5, providing a SIL3 safety level according to
EN 61508 standards and Pl level according to EN13849-1/2 standards when properly designed and used
following the recommendations of both manufacturers.
It should be emphasized that, when implementing the safety functions, data related to STO function reliability
(listed in the 1S5F94 Safety manual-EN) as well as data related to the encoder signal repetition reliability
should be taken into consideration.
Regarding the latter component, the following factors should be considered as well:
1.
Signal repetition is purely an invariant hardware function.
Thus its functioning is not affected by
other factors or operations. Each potential internal hardware failure that might hold back or alter the
repeated signal is taken into consideration in the PFH (rep) data.
2. Encoder repetition failures that might occur are detectable by the ReeR speed module, which can
provide to a component a maximum diagnostic fault coverage (99%)
The encoder repetition PFH data is assumed to be less than 1x10-9.
