Probability Of Failure Of The Safety Functions - Siemens SINAMICS S120 Function Manual

System features

3.3 Probability of failure of the safety functions

3.3 Probability of failure of the safety functions
Probability of failure
The probability of the failure of safety functions must be specified in the form of a PHF value
(Probability of Failure per Hour) in accordance with IEC 61508, IEC 62061, and ISO 13849-1
(2006). The PFH value of a safety function depends on the safety concept of the drive unit
and its hardware configuration, as well as on the PFH values of other components used for
this safety function.
Corresponding PFH values are provided for the SINAMICS S120 drive system, depending
on the hardware configuration (number of drives, control type, number of encoders used).
The various integrated safety functions are not differentiated.
The PHF values can be requested from your local sales office.
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Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated