Mitsubishi MELSEC-A Series Reference Manual page 196

7. DATA LINK SETTINGS
(3) Assignment of link registers (W)
(a) Assignment for the master station and local stations (M/L area)
Assign 256 points for the master station (M), 256 points for local station No.2
(L2), and 128 points for local station No.3 (L3) with the first half link parameters.
Assign 256 points for the master station (M) and 256 points for local station No.3
(L3) with the second half link parameters.
(b) Assignment for remote I/O stations (M
16 points for the RTOP instruction and 16 points for the RFRP instruction are
required for the remote I/O station No.1 (R1). No.1 requires 17 points (16 points
(for RTOP instruction) + 1 point (for system)) for the M
special function module is installed.
32 points for the RTOP instruction and 32 points for the RFRP instruction are
required for the remote I/O station No.4. No.4 requires 34 points (32 points (for
RTOP instruction) + 2 points (for system)) for the M
function modules are installed.
Fig 7.28 Link register (W) assignment example
(c) The empty areas marked with *1 (in the M/L area) and *2 (in the M
Fig. 7.28 cannot be used as a substitute for data register (D) in the master
station and all local stations.
(d) Since local station No.2 is a MELSECNET-compatible station, the B400 to FFF
range cannot be used.
R area, M
7 - 58
R area)
R area since one
R area since two special
area) in