I am currently facing a issue which I have no clue about. There is an existing project done in step 7 with ET200 IM151 CPU and a KTP600 PN configured in the project. Now I wanted to migrate that panel to the new unified MTP700.. so i migrated from Wincc 2008 SP3 to TIA portal v19,, rewrote some of the screens all done, changed the IP so it matched with the existing plc IP, put the unifed panel under the same subnet as the plc, crosschecked the datablocks if they were the same with the plc code.. everything check outs but I cant establish a connection with the PLC. when I plug the Ethernet lead to the unified panel, all I can see is a solid orange light with no/ very rare blinking and no data transfer but when I plug it back to KTP600 everything  works out perfect.. I can even ping the unified panel through the plc network but as I told no data exchange.. not sure what the issue.. i can share parts of project if needed..