Beckhoff TwinSAFE User Manual Page 47

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Circuit examples
Application Guide TwinSAFE 45
2.7.3.3 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:

    




  
 
S2:

    




  
 
K1/K2:

    




  
 
and the assumption that S1, S2, K1 and K2 are in each case single-channel:

results in a

  

   

  

S1:

  
  
  
S2:

  
  
  
K1/K2:
actuation 1x per shift and direct feedback

  
  
  
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