Pilz PNOZ s30 - Safety-Related Architecture; Achievable Safety Level

Supplementary data
Operating Manual PNOZ s30
1001715-EN-19
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13.3.10.2 Safety-related architecture
SRP/CS
Sensor
Sensor
proximity switch
Logic
+
Diagnostic
Actuator
PNOZ s30
SRP/CS
Logic
SRP/CS
Logic
Sensor
proximity switch
The supply voltage of the proximity switches must be monitored as a measure against sys-
temic failure.
To calculate the safety function you will need the following data for the "sensor" subsystem
and the subsystem "PNOZ s30":
Sensor Subsystem PNOZ s30
Category MTTFd DC Operating mode PFH (1/h)
3 Manufacturer-
specific
60 % Monitoring
2 encoder
1,74E-09
In a worst case scenario, the sensor subsystem's characteristic value MTTFd is calculated
from the inferior (lower) value of the two sensors.
13.3.10.3 Achievable safety level
Safety function PL in accordance with EN
ISO 13849-1: 2015
SIL CL in accordance with
ENIEC62061
Direction
Position
- -
Speed
Speed range
Standstill
PL d (Cat. 3) 2
Please note:
Common cause failures (CCF) are possible for the sensor subsystem. An appropriate ana-
lysis must be carried out.