Hi buddies! my name is sachin and i am working as a electrical and instrument

Hi buddies!
my name is sachin and i am working as a electrical and
instrumentation engineer in a paper plant.
right now i am facing a problem and if someone could help
me it will be an immense pleasure to me.
i am using AC 800M to synchronise DCS500 drives on paper
machine and rewinder.communication is on PROFIBUS and we
are using NPBA-01 module to link profibus to DC drives.But
these days two of these drives are showing a error named
FIELDBUS COMM.TIMED OUT and the drives get tripped.I have
changed the NPBA module and PROFIBUS cable.So if anyone can
do please help me out with this problem.I'll be highly
grateful.

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