Hi
we have a OP030 connected to SINUMERIK 840D .
Sometimes "BT Read dom no db con" occur and after a few days problem solved by itself.

I've read OP030 configuration by 840D but i didn't find anything.

I checked all profibus connections and hardware of OP030.there is no problem.
also I've checked profibus address in sinumerik 840d and it is correct.

what is this ERROR?
How can we solve it ?