Beckhoff TwinSAFE User Manual Page 124

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Circuit examples
122
Application Guide TwinSAFE
2.20.3.2 Diagnostic Coverage DC
Component Value
S1 with testing/plausibility DC
avg
=99%
AX5801 DC
avg
=99%
2.20.3.3 Calculation for block 1
Calculation of the PFH and MTTF
d
values from the B10
d
values:
From:


 

 

and:


  

Inserting the values, this produces:
S1:

    




  
 
AX5801:

    




  
 
and the assumption that S1 is single-channel:

results in a

  

   

  

S1:

  
  
  
AX5801:

  
  
  
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