Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 241

3.
In the I/O assignment setting, set the RJ71EN71 for slot No.0.
[Navigation window]  [Parameter]  [System Parameter]  [I/O Assignment] tab  [I/O Assignment Setting]
4.
Click the [OK] button to add the module labels of the RJ71EN71.
5.
Set the items in "Basic Settings" as follows.
[Navigation window]  [Parameter]  [Module Information]  [RJ71EN71]  [Port 1 Module Parameter (Ethernet)] 
[Basic Settings]
1 FUNCTIONS
1.17 Redundant System Function
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