Probability Of Failure Of The Safety Functions - Siemens SINUMERIK Series Function Manual

1.3

Probability of failure of the safety functions

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 control system and
the drive device, its hardware configuration and the PFH values of the components used to
implement a safety function.
For the SINUMERIK 828 and the SINAMICS S120 drive device, PFH values are made
available 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 safety components of SINUMERIK 828 and
SINAMICS S120 are available in theInternet
document/76254308?lc=en-WW).
● The PFH values of all safety components from Siemens are available in the Safety
Evaluation Tool
machine-safety/safety-evaluation-tool/Pages/default.aspx).
Safety Integrated
Function Manual, 10/2015, 6FC5397-3EP40-5BA3
(http://www.industry.siemens.com/topics/global/en/safety-integrated/
1.3 Probability of failure of the safety functions
(https://support.industry.siemens.com/cs/
Safety instructions
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