Mitsubishi Electric MELSEC Q Series Reference Manual page 171

5 PARAMETER SETTINGS
MELSEC-Q
POINT
In the case of the multiplexed remote I/O network for redundant system, set the link
devices in the tracking settings in the redundant parameters to update the link
devices between the multiplexed remote master station and multiplexed remote
sub-master station. (The set link devices are tracked from the control system to the
standby system via the tracking cable.)
On the network range assignment screen, do not set the devices between the
multiplexed remote master station and multiplexed remote sub-master station.
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