Jevgenijs

did you create a connection in NETPRO?  where did you get LADDR for sfc15? Of course there will be a stop controller - two masters on one profibas can not exist Here is an example on TCP/ip  how to make a connection, and then it is loaded into all controllers, in your case in all three you have the H system. on the profibas system is done similarly.

Hello you need invert bool function?    //invert_bool FUNCTION FC 25 : VOID TITLE = VERSION : 0.1 VAR_INPUT   input : BOOL ;    //press_input END_VAR VAR_OUTPUT   output : BOOL ;     END_VAR VAR_TEMP   temp1 : BOOL ;       temp2 : BOOL ;     END_VAR BEGIN NETWORK TITLE =       A     #input;        FP    #temp1;        =     #temp2;        A     #temp2;        AN    #output;        S     #output;        JC    end;        A     #temp2;        A     #output;        R     #output;  end:  NOP   0;  END_FUNCTION //end_invert_bool   but it's better to change temp1 and temp2 to some merkers or dbx.  

 power suply card (rack slot 0)  is powered by UPS?  Are the output cards powered by a separate power source? does the input fail?