How do you perform calculations for EN IEC 13849-1 when using Danfoss SC Controller ?
In Safety manuall1228981.pdf (Safety Manual PLUS+1 SC Controller Family) stands as follows:
SC Controllers are Category 2 architecture.
Following control subsystems were analyzed:
Input(I) ...
Logic(L) ...
Outputs (O) ...
Up to that point everything is clear. But then Table 1 is shown and here problems start. Can anyone provide manual for using Table 1 from this document?
What diference is between MTTF with DU, DD SD, SU ? What does Fail Low Fail High and No Effect mean? Ad and Au ?
And finaly, how to calculate MTTF/PFHd and by that Performance Level for SC Danfoss Controller ?
(simple example would be needed i think, something like emergency stop lets say, button + logic + contactor, PLr = d)
