Mitsubishi MELSEC-A Series Reference Manual page 182

7. DATA LINK SETTINGS
(3) Assignment of link relays (B)
Fig 7.21 Link relay (B) assignment example
(a) The empty area marked with *1 in the M/L area for the first half link parameters in
Fig 7.21 assigned cannot be used as a substitute for internal relays (M) in the
master station and all local stations.
This is also true for any empty area in the M/L area assigned with the second
half link parameters.
(b) The range that can be assigned with second half link parameters is the range
assigned with the first half link parameters: (final device number ) + 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)
In Fig 7.21, since the range of B000 to 8FF is assigned to the first half link
parameters, B900 or later can be assigned to the second half link parameter.
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