Mitsubishi MELSEC-A Series Reference Manual page 110

5. SPECIFICATIONS
(2) MELSECNET composite mode
In the MELSECNET
stations and remote I/O stations can be connected to the master station
(MELSECNET mode-compatible data link module).
By selecting the MELSECNET
MELSECNET mode (previous MELSECNET data link system) and those compatible
with the MELSECNET
(a) As for link relays (B) and link registers (W), data link is possible up to 4096 points
in the range of B/W0 to FFF.
(b) The maximum number of link points per master station or MELSECNET
mode-compatible local station is 2048 bytes.
The MELSECNET
link parameter. Since up to 1024 bytes can be assigned, up to 2048 bytes can be
used for data link.
In this regard, however, the MELSECNET mode-compatible local station is up to
1024 bytes which is the same as that of MELSECNET mode and the
MELSECNET mode-compatible remote I/O station is up to 512 bytes.
POINT
A MELSECNET mode-compatible local station can only read the range of link
relays (B) and link registers (W) assigned to the first half link parameter. Devices
assigned to the second half link parameter cannot be read.
L1 station in Fig 5.10, for example, cannot read the devices in the range of B/
W300 to 4FF because it is used for a MELSECNET mode-compatible data link
module.
MELSECNET mode-compatible master stations and local stations can read the
range assigned to both the first and second half link parameters.
composite mode, MELSECNET mode-compatible local
composite mode, data link modules used in the
mode can be used within the same data link.
mode has the first half link parameter and the second half
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