After recycling the power of DP/DP coupler BF is not getting OK

Hi all,

We have one S7-400 PLC and ABB AC861 PLC. We connected them both via DP/DP coupler. Communication is happening but after recycling the power of DP/DP coupler siemens side BF is not getting OK. We have to switch the CPU to stop and then to Run for rectifying it. 

What should we do to make it work even after power recycle?

Regards

Surendhar M

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Split from Dpdp coupler and repeater.

hi,

what means "not OK"?

Can you get a further diagnostic? have a look online, what the masters are complaining about.

What about the wiring of your Profibus-net? Are the resistors on, at both ends of the bus?

Are both Masters DPV1-master?

regards,

Hello,

maybe taking a look to diagnostic buffer can be fine. Other solution also can be put some OBs to prj and download to CPU.