Data Communications Using Auto Refresh - Mitsubishi Electric MELSEC Q Series User Manual

14.1.2

Data communications using auto refresh

This is a communication method that uses the auto refresh area in the CPU shared memory.
This section described processing in this communication method, and setting methods.
(1) Processing overview
The following shows the processing of data communication when using auto refresh.
Programmable controller CPU, Motion CPU
Host CPU operation information area
Auto refresh area for programmable
controller CPU (Motion CPU)
1)
For programmable controller CPU (Motion CPU)
For C Controller module
Processing
1)
2)
3)
4)
Auto refresh cannot be used for communication between a C Controller module and Motion CPU(Q172DCPU(-S1),
Q173DCPU(-S1),Q172DSCPU,Q173DSCPU).
Use the auto refresh function in the multiple CPU high speed transmission area.
Page 261, Section 14.1.3
256
CPU shared memory
System area
User setting area
Device
In END processing of programmable
controller CPU or Motion CPU
Data in the device for programmable controller CPU
(or Motion CPU) are transferred to the auto refresh
area in the CPU shared memory.
–
–
Auto refresh area data in the C Controller module
are transferred to the device for C Controller module
in the programmable controller CPU (or Motion
CPU).
Q24DHC-V Q24DHC-VG
Host CPU operation information area
3)
4)
Execution of QBF_ToBuf function
Execution of QBF_FromBuf function
At bus interface function execution of C
Execution of the bus interface function (QBF_ToBuf)
transfers user program settings to the auto refresh
area in the C Controller module's CPU shared
memory.
Execution of the bus interface function
(QBF_FromBuf) transfers the auto refresh area data
of the programmable controller CPU (or Motion
CPU) to the user program.
Q24DHC-LS Q26DHC-LS
C Controller module
CPU shared memory
System area
Auto refresh area for
C Controller module
User setting area
2)
User program
Controller module
–
–
Q12DC-V