2 safety-related architecture, 3 achievable safety level – Pilz PNOZ s30 24-240VACDC 2 n/o 2 n/c User Manual
Page 82
Supplementary data
Operating Manual PNOZ s30
1001715-EN-13
82
Safety-related architecture
Sensor
proximity switch
Actuator
SRP/CS
Actuator
SRP/CS
Sensor
PNOZ s30
Logic
+
Diagnostic
SRP/CS
Logic
Sensor
proximity switch
To calculate the safety function you will need the following data for the "sensor" subsystem
and "PNOZ s30" subsystem:
Sensor
PNOZ s30 subsystem
Category MTTFd
DC
Operating mode
PFH (1/h)
4
Manufactur-
er-specific
90 % Monitoring
2 encoders
1,44E-09
In a worst case scenario, the sensor subsystem's characteristic value MTTFd is calculated
from the inferior (lower) value of the two sensors.
Achievable safety level
Safety function
PL in accordance with EN
ISO 13849-1: 2006
SIL CL in accordance with
EN IEC 62061
Direction
Position
-
-
Speed
Speed range
Standstill
PL e (Cat.4)
3
Please note:
Common cause failures (CCF) are possible for the sensor subsystem. An appropriate anal-
ysis must be carried out.
To use proximity switches 1 and 2 we recommend that you:
}
Use different technologies/design or physical principles (e.g. different manufacturers)
and
}
Evaluate the encoder supply via track S
9.2.9.2
9.2.9.3