Mitsubishi Electric MELSEC Q Series User Manual page 191

(e) Data writing to other CPU's shared memory
Data cannot be written to the CPU shared memory of other CPU with a write instruction.
Writing data to the CPU shared memory of other CPU No. with TO, S.TO instructions or those using the
multiple CPU area device (U3En\G ) may result in "SP. UNIT ERROR (error code: 2115)".
(f) Data writing to host CPU's shared memory
1) Basic model QCPU
Data can be written to the host CPU's shared memory with a write instruction.
2) High Performance model QCPU or Process CPU
Data can be written to the host CPU's shared memory with the S.TO instruction, not with the instruction using
the multiple CPU area device (U3En\G ).
Writing data to the host CPU's shared memory with the instruction using the multiple CPU area device
(U3En\G ) results in "SP.UNIT ERROR (Error code: 2114)".
3) Universal model QCPU
Data can be written to the host CPU's shared memory with a write instruction.
(g) Data reading from CPU shared memory
1) Basic model QCPU
Data can be read from the host CPU's shared memory with a read instruction.
2) High Performance model QCPU or Process CPU
Data cannot be read from the host CPU's shared memory with a read instruction.
Doing so results in "SP.UNIT ERROR (Error code: 2114)".
3) Universal model QCPU
Data can be read from the host CPU's shared memory with a read instruction.
(h) Access to CPU that is not actually installed
Access to the CPU that is not actually installed with an instruction using the multiple CPU area device
(U3En\G ) is not allowed.
Doing so leads to "SP.UNIT ERROR (Error code: 2110)".
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