Mitsubishi Electric MELSEC Q Series User Manual page 183

(1) Communication made by program
(a) Instructions used for writing to/reading from the CPU shared memory
The QCPU in a multiple CPU system enables to communicate each CPU module using user free areas in CPU
shared memory and multiple CPU high speed transmission area with the write and read
The Table4.11 shows the write/read instruction.
Write instruction
Read instruction
*1: When accessing multiple CPU high speed transmission area, the processing speed is faster than when using any of the
TO, DTO, FROM or DFRO instructions.
*2: Using the S.TO instruction, data cannot be written to user setting area in multiple CPU high speed transmission area.
*3: For the TO/DTO/S.TO instruction (write instruction) and the FROM/DFRO instruction (read instruction), refer to the
following manual.
QCPU Programming Manual(Common Instructions)
High
Note4.8
performance
For the High Performance model QCPU or the Process CPU, write to the CPU shared memory with TO instruction is
not allowed.
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Table4.11 List of write and read instructions
• Instruction using the multiple CPU area device (U3En\G )
*3
• TO instruction
*2
• S.TO instruction
• Instruction using the multiple CPU area device (U3En\G )
*3
• FROM instruction
Process
Description
Note4.8
*2
instructions.íç1
*1
*1