Mitsubishi MELSEC-A Series Reference Manual page 191

7. DATA LINK SETTINGS
(4)
(c) The device range that can be assigned with the second half link parameters is
the range assigned with the first half link parameters: "(final device) + 1 " or later.
(Example: If the range of B0 to FF is assigned to the first link parameters, "B100"
or later can be assigned to the second half parameters)
If 0 point is assigned with the first half link parameters, assignment with the
second half link parameters can be started with W0.
Divide the M/R area in link register (W) into the M
assign them.
Only the W0 to 3FF range can be used for the M/R area.
(a) When connecting more than one remote I/O station, assign an M
an M R area to each remote I/O station.
For example, when connecting two remote I/O stations, divide the M
and M R area into two stations as illustrated below and assign them.
Fig 7.25 Link register (W) assignment example
7 - 53
R area and the M R area and
R area and
R area