Supplementary data
Operating Manual PNOZ s30
1001715-EN-19
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13.3 Categories
13.3.1 Safety level
The maximum achievable safety level depends on the encoder, the wiring and the operat-
ing mode of the PNOZ s30.
In accordance with EN ISO 13849-1, values for the following characteristic data is needed
to determine the performance level (PL):
} Category: Structure: single or dual channel, single fault safety
} MTTFd: Mean time to dangerous failure
} DC: Diagnostic coverage
} CCF: Quantification of measures against common cause failure (necessary for Cat.2 to 4)
INFORMATION
The safety-related characteristic data of the PNOZ s30 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 calculate the
safety function's SIL/PL values.
The safety assessments below only consider the subsystems Sensor and
PNOZ s30. The Actuator subsystem depends on the application and must
also be considered in the overall assessment.
Information on the safety-related characteristic data for the subsystems Sensor and PNOZ
s30
Example:
Sensor subsystem PNOZ s30 subsystem
Category MTTFd DC Operating mode PFH [1/h]
2 Manufac-
turer-spe-
cific
90 % Monitoring
1 encoder
2,88E-08
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 device
manufacturer.
Assuming that all errors are dangerous, MTTF = MTTFd can be set.
The characteristic data MTTF is a property of the sensor, which can only be stated by the
manufacturer.
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