Mitsubishi MELSEC-A Series Reference Manual page 206

7. DATA LINK SETTINGS
7.10.3 Using the MELSECNET
The link relay (B) and link register (W) range which can be assigned to the third tier is
described per operation mode used in the third tier. Since the assignment of M/L area for
link relay (B) is the same as that of M/L area for link register (W), the assignment of the link
register (W) is only explained.
The link assignment range of input (X) and output (Y) is the same regardless of
combinations of operation modes. Refer to Section 7.10.1 (5).
(1) MELSECNET mode used in the third tier
(a) The range assigned to the master station for the third tier with the first half link
(b) The empty area within the W0 to 3FF range assigned with link parameters for the
(2) MELSECNET
(a) The range assigned to the master station for the third tier with the first half link
(b) The range assigned to the master station for the second tier with the second half
mode in the second tier
parameters for the second tier is used for the M/L area for the third tier.
The range assigned to the master station for the third tier with the second half
link parameters for the second tier cannot be used.
second tier is used for the M/R area for the third tier.
Fig 7.38 Assignment when the MELSECNET mode is used for the third tier
mode used in the third tier
parameters for the second tier is used for the first half link parameters for the
third tier.
link parameters for the second tier is used for the second half link parameters for
the third tier. If no area is set to the second half link parameters, use the area
that begins after the M/L area assigned to the first half link parameters for the
second tier.
Fig 7.39 Assignment when the MELSECNET
MELSECNET mode MELSECNET
MELSECNET MELSECNET
Operating Mode
mode
mode
Applicability
mode is used for the third tier
7 - 68
MELSECNET/B
MELSECNET MELSECNET MELSECNET MELSECNET
composite mode mode composite mode
mode