Mitsubishi Electronics Q06UDVCPU ユーザーズマニュアル
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6.1
Communications Using the CPU Shared Memory
This section describes data communications among CPU modules in a multiple CPU system using the CPU shared
memory.
memory.
(1) CPU shared memory
The CPU shared memory is a data storage area in a CPU module and used to read/write data among CPU
modules in a multiple CPU system.
The CPU shared memory consists of the areas listed below.
modules in a multiple CPU system.
The CPU shared memory consists of the areas listed below.
Use of the multiple CPU high speed transmission area enables high-speed transmission by reducing the increase in scan
time. Some conditions apply to using the area.
time. Some conditions apply to using the area.
• Data communications by auto refresh:
• Data communications by programs:
Area
Description
Reference
Host CPU operation information area
An area used to store error information and LED status of the CPU
module
module
System area
An area used by the operating system of the CPU module
–
Auto refresh area
An area used to communicate data by auto refresh.
This area starts from the next address of the last address in the
system area.
This area starts from the next address of the last address in the
system area.
User setting area
An area used to communicate data by a program.
This area is assigned to the later addresses of those used for the
auto refresh area. If auto refresh is not performed, the area starts
from the next address of the last address in the system area.
This area is assigned to the later addresses of those used for the
auto refresh area. If auto refresh is not performed, the area starts
from the next address of the last address in the system area.
Multiple CPU high speed
transmission area
transmission area
An area to communicate data with other CPU modules in the
multiple CPU system using Universal model QCPUs (except the
Q00UCPU, Q01UCPU, and Q02UCPU)
multiple CPU system using Universal model QCPUs (except the
Q00UCPU, Q01UCPU, and Q02UCPU)
User setting area
An area used to communicate data by a program.
This area is assigned to the address 10000
This area is assigned to the address 10000
H
and later of the CPU
shared memory.
Auto refresh area
An area used to communicate data by auto refresh