I want to know which station is cut off the power from it , in PROFIBUS network?

I want to know which station is cut off the power from it , in PROFIBUS network?
with mention ,I have connected three CPU313C-2DP together , when cut off the power about any CPU, I want to know which station cut off the power from it?

Do you have active (Powered) terminations on the two ends of the Profibus Network?

yes
with mention I use SFC 13wihtin OB86 but I see the output of SFC 13 separate the input of SFC 13 and always get me Master address and when the power cuts off the slave(CPU313C-2DP).