Mitsubishi MELSEC-Q Series User Manual page 176

4
COMMUNICATIONS BETWEEN CPU MODULES
1) Multiple CPU high speed
transmission area
No. Name
Multiple CPU high speed
1)
transmission area
CPU No. n send area
2)
n (n=1 to 4)
3) User setting area
4) Auto refresh area
4
- 26 4.1 Communications between CPU modules using CPU shared memory
4.1.3 Communication by auto refresh using multiple CPU high speed transmission area
(c) Memory configuration of multiple CPU high speed transmission area
The following explains the memory configuration of the multiple CPU high speed
transmission area of the CPU shared memory that is used in the multiple CPU
high speed transmission function. (For the CPU shared memory, refer to Section
4.1.1.)
Diagram 4.25 Memory configuration of multiple CPU high speed transmission area
Table4.6 Description of multiple CPU high speed transmission area
• Area for data transmission between each CPU
modules in the Multiple CPU system.
• The area up to 14k word is divided by each
CPU module that constitutes the Multiple CPU
system.
• Area to store the send data of the each CPU
module.
• Sends the data stored in the send area of the
host CPU to the other CPUs.
• Other CPU send area stores the data received
from the other CPUs.
• Area for data communication with other CPUs
using the multiple CPU area device.
• Can be accessed by the user program using
the multiple CPU area device.
• Area for communicating device data with other
CPUs by the communication using the auto
refresh.
POINT
When the COM instruction is used in the sequence program, the auto refresh can
be executed automatically at the execution of the COM instruction.
However, the scan time is prolonged due to the processing time for the auto
refresh.
For details of the COM instruction, refer to the following manual.
QCPU(Q mode)/QnACPU Programming Manual (Common Instructions)
2) CPU No.1 send range
2) CPU No.2 send range
2) CPU No.3 send range
2) CPU No.4 send range
Description
3) User setting area
4) Auto refresh area
Size
Setting range Setting unit
0 to 14k words 1k word
0 to 14k words 1k word
0 to 14k words 2 words
0 to 14k words 2 words