Mitsubishi MELSEC-A Series Reference Manual page 207

7. DATA LINK SETTINGS
(3)
Fig 7.40 Assignment when the MELSECNET
MELSECNET composite mode used in the third tier
(a) First half link parameters for the third tier
1) The range assigned to the master station for the third tier with the first half link
parameters for the second tier is used for the M/L area.
2) The empty area within the W0 to 3FF range assigned with link parameters for
the second tier is used for the M/R area.
(b) The area assigned to the master station for the third tier with the second half link
parameters for the second tier is used for the second half link parameters for the
third tier.
POINT
When the MELSECNET mode or the MELSECNET
as the operation mode for the third tier, consider the following points when setting
link parameters for the second tier.
(1) The device range assigned to the master station for the third tier is within the
B0 to 3FF range and the W0 to 3FF range. If the B400 to FFF range or W400
to FFF range is assigned to the master station, the area cannot be used for
the first half link parameters (including the MELSECNET mode link
parameter) for the third tier.
(2) When an M/R area is required for the third tier, provide an empty area in the
W0 to 3FF range with the link parameters for the second tier.
composite mode is used for the third tier
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composite mode is selected