[?]: Problem in S7-400H ProfiBus network

[mohammedhhh]

I have S7-400 redandant system with 4 DP master ProfiBus branches.
each branch have around 20 nodes.
some nodes with S7-300 and CP have bus fault on both CPU and CP when these nodes connected allmost all bus nodes have bus fault when i remove connector for this nodes the other nodes is working ok.
some CP have bus fault but working with CPU DP connection.
i check addresses for all nodes no confilect

[Janosch07]

Mohammed,

I would first check the diagnostic buffer of the H CPU and see which slaves are faulty. To do so, from any CFC chard use the CPU menu then "Module Information" and see what in the diag. buffer.

Regards
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[mohammedhhh]

The problem was in one room which have the motor converters and we find that some body change one ProfiBus terminating switch at the end of anther branch very far from the working area.
thank you.