Hi hdhosseini,

I have a similar problem, my case is I have a s7-400 PLC as master and it link with over 70 slave PLCs (S7-300) in few profibus networks. I am using SFC51 to verify for the profibus network connection now. If I would like to monitor even the slave CPU SF LED status and all the slave PLC I/O cards SF status, what can I do? can SFC51 do the job?

At slave PLC, the profibus network connection is either connected to CP-342-5 card or to the CPU DP port.

Can this be done without touching slave PLC? As all the slave PLC are own by other company.

Thanks.

Best regards,

YKW