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VAA-2E-KE1-S
Safety
Note
The plant management is responsible for heeding local safety regulations.
2.4
Transfer time of the safety-relevant information
The transfer time depends essentially on the monitor. The corresponding documentation and
the switch-off times of the actuators must be observed.
2.5
Probability of Failure on Demand Calculation
To calculate the probability of dangerous failure on demand (PFD) of a safety-related function,
the PFD values for all components used within this function must be taken into consideration. In
the case of dual-channel applications, the AS-Interface safe input module does not significantly
contribute to the PFD or PFH (probability of dangerous failure per hour) of the overall system.
The PFD and PFH values for single-channel application can be found in the data sheet. The
PFD or PFH values of the other components, in particular the safety monitor, can be found in
the relevant documentation.
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