Safety-Related Architecture; Achievable Safety Level - Pilz PSSu K F EI Operating Manual

Supplementary data
9.1.8.2

Safety-related architecture

To calculate the safety function you will need the following data for the "sensor" subsystem
and the subsystem "PSSu K F EI":
Sensor
Category
4
In a worst case scenario, the sensor subsystem's characteristic value MTTFd is calculated
from the inferior (lower) value of the two sensors.
9.1.8.3

Achievable safety level

Monitoring function
SOS-M
SDI-M
SS2-M
SSR-M
SSM
SS1-M
Please note:
For the "sensor" subsystem, a minimum speed must be exceeded within forced dynamisa-
tion.
The minimum speed depends on the ratio of the frequency at tracks AB "f
quency at track Z "f
}
when fAB/fZ Verh. ≥ 1.0
f = 10 mHz or f
Z
}
when f
f = 10 mHz or f
AB
At the very latest, a feasibility error will be detected when a tolerance expires. The toler-
ance level depends on the ratio of the frequency at tracks AB "f
Z "f " in your configuration (fAB/fZ Verh. setting in the menu) and is calculated as follows:
Z
Operating Manual PSSu K F EI
1003303-EN-03
SRP/CS
Sensor
Sensor
non-safe encoder
Sensor
proximity switch
MTTFd
Manufacturer-
specific
PL of EN ISO 13849-1:
2015
PL c (Cat.1)
PL e (Cat.4)
" in your configuration and is calculated as follows:
Z
= (f /f ) x 10 mHz
AB AB Z
/f Verh. < 1.0
AB Z
= 10 mHz/(f
Z
SRP/CS
Logic
PSSu K F EI
Logic
+
Diagnostic
Subsystem PSSu K F EI
DC Operating mode
90 % Monitoring
2 sensors
/f )
AB z
SRP/CS
Logic
Actuator
PFH (1/h)
1,01E-09
SIL CL in accordance with
EN IEC 62061
-
3
" to the fre-
AB
" to the frequency at track
AB
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