System Features
3.4 Probability of failure of the safety functions (PFH value)
Safety Integrated
Function Manual, 05/2010, A5E03264275A
47
NOTICE
Changing the EDS with safe motion monitoring
An encoder that is used for Safety Functions should not be switched over when a data set
is switched over.
The Safety Functions check the safety-relevant encoder data for changes when data sets
are switched over. If a change is detected, fault F01670 is displayed with a fault value of
10, which results in a non-acknowledgeable STOP A. The safety-relevant encoder data in
the various data sets must therefore be identical.
3.4 Probability of failure of the safety functions (PFH value)
Probabilities of failure
The probability of failure of safety functions must be specified in the form of a PFH value
(Probability of Failure per Hour) in accordance with IEC 61508, IEC 62061, and 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.
For SINAMICS drives and cabinets G130, G150, S120 Chassis, S120 Cabinet Modules and
S150, PFH values are available depending on the hardware configuration (number of drives,
type of control, 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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