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my point of view fx 3u is better 4ever because fx3u support all functions transfer speed is more efficency in fx5u and fx5u is very slow online communication monitor and change take more times . fx3u enet module u can open 8 ports ..
Please you select security level device address example d0 then select security level 0,1,2,3... enter password number then goto which screen you need password that screen open properity window then select security level... that's it.