Mitsubishi MELSEC-A Series Reference Manual page 195

7. DATA LINK SETTINGS
(2) Assignment of link relays (B)
(a) Assign 256 points for the master station, 256 points for local station No.2, and
256 points for local station No.3 with the first half link parameters.
Assign 256 points for the master station and 256 points for the local station No.3
with the second half link parameters.
Fig 7.27 Link relay (B) assignment example
(b) The empty area marked with *1 in the M/L area for the first/second half link
parameters in Fig 7.27 cannot be used as a substitute for internal relays (M) in
the master station and all local stations.
(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 number
allocated with the first half link parameters) + 1 " or later.
In Fig 7.27, since the range of B000 to 37F is assigned to the first half link
parameters, B380 or later can be assigned to the second half link parameters.
(d) Since local station No.2 is a MELSECNET mode-compatible station, the B400 to
FFF range cannot be used.
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