Mitsubishi Electric MELSEC Q Series Reference Manual page 156

(c) Setting network parameters in the programming tool
1.
Set the mode of the system A to the online mode.
Set the network parameters in the programming tool as shown below.
2.
Set the mode of the system B to the hardware test mode.
Select "H/W Test" for "Mode (System B)" in the "Redundant Setting" window of the network parameter of
the programming tool.
3.
Connect the programming tool to the system B CPU module, and write the parameters to the
module.
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