Mitsubishi MELSEC-A Series Reference Manual page 201

7. DATA LINK SETTINGS
(4) When the MELSECNET
the link relay (B) and link register (W) range that can be assigned with the first and
second half link parameters is as shown below.
(a) Assign the range assigned with the first half link parameters for the second tier
with the first half link parameters for the third tier.
Assign the range assigned with the second half link parameters for the second
tier with the second half link parameters for the third tier.
Fig 7.32 When both first and second half link parameters are assigned for second tier
(b) When the selected mode only provides one type of link parameter (the second
tier is used for MELSECNET mode) or when the second half link parameters are
not assigned, 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 ) + 1" or later.
(Example: If the range of B0 to FF is assigned to the first half link parameters for
second tier, "B100"or later can be assigned to the second link parameters for the
third tier.)
Fig 7.33 When only first half link parameters for the second tier are assigned
mode or MELSECNET
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composite mode is selected,