13
COMMUNICATIONS BETWEEN CPU MODULES
13.3 Data Communications Using CPU Shared Memory
13.3.3 Communication using the multiple CPU high speed transmission area and auto refresh
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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
(2) Communication using auto refresh
(a) Outline of auto refresh
Auto refresh is a communication method using the auto refresh area in the
multiple CPU high speed transmission area of the CPU shared memory.
Data written to the auto refresh area in the multiple CPU high speed transmission
area are sent to another auto refresh area of another CPU at regular intervals
(multiple CPU high speed transmission cycle).
To set the communication using auto refresh, open the <<Multiple CPU settings>>
tab in C Controller setting utility and set "Multiple CPU high speed transmission
area setting".
The auto refresh allows a CPU to use another CPU's device data, which have
been received automatically.
Figure 13.17 shows an auto refresh operation of a system in which a Universal
model QCPU and a C Controller module is set as CPU No.1 and CPU No.2
respectively.
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