Mitsubishi MELSEC-Q Series User Manual page 534

14
COMMUNICATIONS BETWEEN CPU MODULES
C Controller module 1)
CPU shared memory
Host CPU operation information area
System area
Auto refresh area
Data written by QBF_ToBuf function
of C Controller module 1)
(User free area)
1. Write by QBF_ToBuf function
of C Controller module 1)
User program
Execution of QBF_ToBuf function
Execution of QBF_FromBuf function
14
- 17 14.3 Data Communications Using CPU Shared Memory
14.3.3 Data communications without using auto refresh
(b) Between C Controller modules
3. Read by QBF_FromBuf
function of C Controller
module 2)
4. Read by QBF_FromBuf
function of C Controller
module 1)
Processing details at bus interface function execution of C Controller module 1)
1. Execution of the QBF_ToBuf function writes data to the user free area
of the C Controller module 1)'s CPU shared memory.
4.
Execution of the QBF_FromBuf function reads the user free area data
of the C Controller module 2) to the user program.
Processing details at bus interface function execution of C Controller module 2)
2. Execution of the QBF_ToBuf function writes data to the user free area
of the C Controller module 2)'s CPU shared memory.
3. Execution of the QBF_FromBuf function reads the user free area data
of the C Controller module 1) to the user program.
Figure 14.14 Processing of communications without using auto refresh
C Controller module 2)
CPU shared memory
Host CPU operation information area
System area
Auto refresh area
Data written by QBF_ToBuf function
of C Controller module 2)
(User free area)
2. Write by QBF_ToBuf function
of C Controller module 2)
User program
Execution of QBF_ToBuf function
Execution of QBF_FromBuf function