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Supplementary data
9
Supplementary data
9.1
Categories
9.1.1
Safety level
The maximum achievable safety level depends, among other things, on the sensor, the wir-
ing and the operating mode of the PSSu K F EI.
Information on the safety-related characteristic data for the subsystems Sensor and PSSu
K F EI
Example:
Sensor subsystem
Category
2
The values for Category and DC can be set for the sensor subsystem, bearing in mind the
restrictions stated in the respective chapter. The MTTFd value must be stated by the
sensor manufacturer.
Assuming that all faults are dangerous, MTTF = MTTFd can be set.
The characteristic value MTTF is a property of the sensor, which may only be stated by the
manufacturer.
Forced dynamisation:
When monitoring sensors with square output signals (TTL, HTL) or safe sensors, the axis
must be moved within 8 hours so that the signal changes on all the connected tracks.
9.1.2
Safety functions
The following safe monitoring functions are available:
}
Safe Speed Monitoring (SSM)
}
Safe Speed Range Monitoring (SSR-M)
}
Safe Direction Monitoring (SDI-M)
}
Safe Operating Stop Monitoring (SOS-M)
}
Safe Stop 1 Monitoring (SS1-M)
Operating Manual PSSu K F EI
1003303-EN-03
INFORMATION
The safety-related characteristic data of the PSSu K F EI and all other
devices that are used must be taken into account when calculating the
safety level. We recommend that you use the PAScal software tool to calcu-
late the safety function's SIL/PL values.
The safety assessments below only consider the subsystems Sensor and
PSSu K F EI. The Actuator subsystem depends on the application and must
also be considered in the overall assessment.
MTTFd
DC
Manufac-
90 %
turer-spe-
cific
Subsystem PSSu K F EI
Operating mode
Monitoring
1 sensor
PFH [1/h]
1,80E-08
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