Pilz PSSu K F EI CV Operating Manual page 72

Supplementary data
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
} when fAB/fZ Verh. ≥ 1.0
7.5 Z-pulses or 7.5 x (f
} when fAB/fZ Verh. < 1.0
4.5 AB-pulses or 4.5/(f
9.1.9 Safety-related characteristic data for operation with 2 proximity
switches
9.1.9.1 Permitted sensor types and output signals
Non-safety-related sensor
Permitted output circuits:
}
pnp
}
npn
9.1.9.2 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 CV(-T)":
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.
Operating Manual PSSu K F EI CV(-T)
1004290-EN-04
/f ) AB-pulses
AB Z
/f ) Z-pulses
AB Z
SRP/CS
Sensor
Sensor
proximity switch
Sensor
proximity switch
MTTFd DC
Manufacturer- 90 % Monitoring
specific
SRP/CS
Logic
PSSu K F EI CV
Logic
+
Diagnostic
Subsystem PSSu K F EI CV(-T)
Operating mode
2 sensors
" to the frequency at track
AB
SRP/CS
Logic
Actuator
PFH (1/h)
1,01E-09
72