The FX3U-ENET-L and FX3U-ENET-ADP are Ethernet-connectable.
The FX3U-ENET-L can be used with the FX3U and FX3UC series (both Ver. 2.21 or later).
The FX3U-ENET-ADP can be used with the FX3U and FX3UC series (both Ver. 3.10 or later) and the FX3G and FX3GC series (both Ver. 2.00 or later).

* The version of main units can be checked on the PLC Diagnostics window of GX Works2(or GX Developer) or with the last three digits of the data stored in the special register D8001 (PLC type and system version).
For Example, when the special register D8001 is monitored with GX Works2, the numerical number "24310" as a decimal number stored in the D8001, the last three digits "310" represent the version.
In this case, the version is Ver. 3.10.