Mitsubishi MELSEC-A Series Reference Manual page 93

5. SPECIFICATIONS
(2) Read/write of buffer memory in a special function module installed to a remote I/O
station
Use RFRP or RTOP instruction to read/write buffer memory of a special function
module installed to a remote I/O station from the master station.
Data communication can be executed between the master station and a remote I/O
station only when RFRP or RTOP instruction is executed.
To use RFRP or RTOP instruction, link registers (W) are assigned to the remote I/O
station with the link parameter.
The buffer memory data is read or data is written to the buffer memory in the special
function module loaded to the remote I/O station with the link registers. (Refer to
Section 9.8 for details on RFRP and RTOP instructions.)
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