Local/Remote I/O System Assignment - Mitsubishi MELSEC-A Series Reference Manual

7. DATA LINK SETTINGS
7.9.3

Local/remote I/O system assignment

When setting link parameters of a local/remote I/O system, consider the following points
for assignment.
(1) Link relay assignment
For link relay (B), determine an assigned range for each of master and local stations.
(Refer to Section 7.4.3.)
(a) Examine the link relay (B) assignment range with the first and second half link
(b) The setting range of the first half link parameters is B0 to 3FF.
(c) The device range that can be assigned with the second half link parameters is
(2) When a special function module is installed to a remote I/O station
Link registers (W) are required for reading/writing buffer memory (RFRP/RTOP
instruction).
Divide the link registers (W) in the W0 to 3FF range to be assigned with the first half
link parameters into the M/L area (for communication between the master station and
a local station) and the M/R area (for communication between the master station and
a remote I/O station) and assign them.
(3) Link register assignment
For the M/L area of link registers (W), determine an assigned range for each of
master and local stations.
(a) Examine the link register (W) assignment range of the first and second half link
(b) The device range that can be assigned with the first half link parameters is W0 to
parameters for each MELSECNET
The device range assigned with the first half link parameters can be read by the
master station and all local stations. However, the range assigned with the
second half link parameters can only be read by MELSECNET
compatible stations.
Determine the assignment range according to the station with which data
communication will be executed.
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 link parameters, "B100"
or later can be assigned to the second half parameters)
If 0 point is assigned with the first half link parameters, assignment with the
second half link parameters can be started with B0.
parameters for each MELSECNET
The device range assigned with the first half link parameters can be read by the
master station and all local stations. However, the range assigned with the
second half link parameters can only be read by MELSECNET
compatible stations.
Determine the assignment range according to the station with which data
communication will be executed.
3FF.
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MELSECNET mode
MELSECNET
MELSECNET MELSECNET
Operating Mode
mode
mode
Applicability
mode-compatible station.
mode-compatible station.
MELSECNET/B
MELSECNET MELSECNET MELSECNET MELSECNET
composite mode mode composite mode
mode
mode-
mode-