Mitsubishi MELSEC-Q Series User Manual page 189

4
COMMUNICATIONS BETWEEN CPU MODULES
(1) Communication made by program
High
Process
Performance
Write instruction
Note4.8
Read instruction
Note8
High
For the High Performance model QCPU or the Process CPU, write to the CPU shared memory
Process
Performance
with TO instruction is not allowed.
Note4.8
(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 instructions.
The table 4.11 shows the write/read instruction.
Table4.11 List of write and read instructions
• Instruction using the multiple CPU area device (U3En\G )
*3
• TO instruction
• S.TO instruction
• Instruction using the multiple CPU area device (U3En\G )
*3
• FROM 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(Q mode)/QnACPU Programming Manual(Common
4.1 Communications between CPU modules using CPU shared memory
4.1.4 Communication using CPU shared memory by program
Description
Note4.8
*2
*2
*1
*1
Instructions)Note8
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