Dave W.

I have a solution from Mitsubishi. It looks like the on board Ethernet is compatible with System-Q and L-Series. In the attachment you find a demo project for GX Works3 which is based on the library "LQnUDEModbusTCP_GW2_V110". This project works fine with my FX5U. So Modbus-TCP server and client is possible with FX5U without big  effort. FX5ModbusTCP_GW3_V100.gx3

Thanks for your fast reply. The FX3U is too old-fashioned for me. Do you know whether the FX3U-ENET P502 works together with the FX5U? There should be an adapter for using with the old modules, as far as I know. The new, fast bus becomes then obsolete but nevertheless .. Dave

In FX3GE the CH1 is used by Ethernet. Use CH2 vor BD-Boards.