Mitsubishi MELSEC-A Series Reference Manual page 193

7. DATA LINK SETTINGS
POINT
(1) If the M R area used by the system is used incorrectly in a user program,
data cannot be read/written correctly, when the RFRP/RTOP instruction is
executed.
(2) The number of link points can be reduced by mounting modules to a remote
I/O station in groups of input modules, special function modules, and output
modules as shown below. If the installation of I/O modules is changed from (a)
to (b), a reduction of 16 input assignment points and 32 output assignment
points can be achieved.
REMARK
When all of the local stations are MELSECNET
module, the master station and all of the local stations can be assigned with
the second half link parameters, which can simplify handshake processing
mentioned in Section 9.1 (4).
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mode-compatible data link