Probability Of Failure Of The Safety Functions (Pfh Value) - Siemens SINAMICS S120 Function Manual

System features

8.3 Probability of failure of the safety functions (PFH value)

8.3 Probability of failure of the safety functions (PFH value)
The probability of failure of safety functions must be specified in the form of a PFH value
(Probability of Failure per Hour) according to IEC 61508, IEC 62061 and DIN EN ISO 13849-
1. 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 PFH values of the individual SINAMICS S120 safety components can be found at:
PFH values (https://support.industry.siemens.com/cs/ww/en/view/76254308)
● The PFH values of all safety components from Siemens are available in the "Safety
Evaluation Tool"; see:
Safety Evaluation Tool
integrated/machine-safety/safety-evaluation-tool/Pages/default.aspx)
354
(http://www.industry.siemens.com/topics/global/en/safety-
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated