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I have a new customer running a Machine with 7 TSX Micro(s) and 6 magelin HMI(s) mostly over rs485.. Customer called with a down line they had a PLC failure and could not get the 485 network back up. i assisted them in troubleshooting and found some issues. We resolved this issue and was able to get most of the line powered , communicating again however they had no setpoints(fun fun). Along the way one of the Sections of this line (PLC 2-Modbus(1,2) and the 2 Hmi's connected to TER,AUX port began giving them issues. Issues are when both units are connetd 1 will Show ! on all the screens assigned to tags while the other will not. once you unplug 1 the other unit will operates as intended. Flip the units and the same thing. I have changed the PLC, Changed the HMI for each section and still have the same results. Note all PLC's are not new but do operate the code "seemingly" correctly. Any help is appreciated. PLC TSX Micro 37 Magelis advanced xbtgt4330 P.S Also looking for vijeo designer 4.6 or 5.0 as these projects were created in 4.6 and there is no direct convert to 6.x