I have 4 Panelview 600 (2711-T6C20L1, Ser B, Rev D and FRN 4.43) in the plant using ethernet for communication. The problem is when I connected to the Main Network I have problem seeing the screen and lost comm, look like it over writen by another Mac address. But the IT have been looking into it and there is nothing in the Network over writen on it. Note: AB support service told me to isolated from the Main Network, but I can not do that, I need it in the Main Network. Any help appreciated. Thanks