Mitsubishi MELSEC-A Series Reference Manual page 106

5. SPECIFICATIONS
(2)
System configuration
Link parameter assignment
Expanded link relay (B) and link register (W) range
The device range that is not assigned to the link parameters for the second tier can
be assigned to the link parameters for the third tier (third tier-1, third tier-2, ... third
tier-n). For this assignment, the same range can be assigned to different data link.
For example, when 512 points of B/W0 to 1FF are used for the second tier as
illustrated in Fig 5.8, the device range of B/W200 to 3FF can be redundantly assigned
to the third-tier-1 link and also to the third-tier-2 link.
Fig 5.8 Expanded use example of link relay (B) and link register (W)
POINT
Since the L3/m station has not been set for expanded use of B/W, its communication range
is as described in Section 5.3.1.
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