Mitsubishi Electric Q12DCCPU-V - Page 433

13
COMMUNICATIONS BETWEEN CPU MODULES
13.3 Data Communications Using CPU Shared Memory
13.3.4 Data communications without using auto refresh
13 - 35
9
DEVICE DESCRIPTION
10
MULTIPLE CPU SYSTEM OVERVIEW
11
MULTIPLE CPU SYSTEM CONFIGURATION
12
CONCEPT OF MULTIPLE CPU SYSTEM
13
COMMUNICATIONS BETWEEN CPU MODULES
14
PARAMETERS ADDED FOR MULTIPLE CPU SYSTEMS
15
STARTING A MULTIPLE CPU SYSTEM
16
TROUBLESHOOTING
(b) Between C Controller modules
Figure 13.24 Communications without using auto refresh
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 setting area)
1. Write by QBF_ToBuf function
of C Controller module 1)
User program
Execution of QBF_ToBuf function
Execution of QBF_FromBuf function
C Controller module 1)
Host CPU operation information area
System area
Auto refresh area
Data written by QBF_ToBuf function
of C Controller module 2)
(User setting area)
CPU shared memory
User program
Execution of QBF_FromBuf function
Execution of QBF_ToBuf function
2. Write by QBF_ToBuf function
of C Controller module 2)
C Controller module 2)
3. Read by QBF_FromBuf
function of C Controller
module 2)
4. Read by QBF_FromBuf
function of C Controller
module 1)
At bus interface function execution of C Controller module 1)
QBF_ToBuf function execution writes the data to the user setting area
in the CPU shared memory of C Controller module 1).
QBF_FromBuf function execution reads out the user setting area data
of C Controller module 2) onto the user program.
1.
4.
At bus interface function execution of C Controller module 2)
QBF_ToBuf function execution writes the data to the user setting area
in the CPU shared memory of C Controller module 2).
QBF_FromBuf function execution reads out the user setting area data
of C Controller module 1) onto the user program.
2.
3.