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16 MULTIPLE CPU SYSTEM FUNCTION
16.4 Data Communication Between CPU Modules
Refresh settings
The refresh can be set up with "Refresh Setting between Multiple CPUs" in "CPU Parameter".
[CPU Parameter] [Refresh Setting between Multiple CPUs]
Set a blank column for "Head" and "End" and set only number of points so that the setting by which auto
refresh is not conducted can be configured. (It is possible to perform setting which does not allow the refresh
data of other CPU modules, which is unwanted for the host CPU module, to be obtained.)
■Enabling timing of refresh settings
The refresh settings are enabled at the following timing:
• When CPU module is powered off and on or is reset.
• When the operating mode is switched from STOP to RUN after the parameters are written to the CPU module (STOP
RUN STOP RUN).
CPU module operating status and refresh behavior
When the refresh timing coincides with the period specified in the fixed scan communication setting, the refresh behavior
depends on the operating status of the CPU module.
*1 In the disabling interrupt state by the DI instruction, the refresh is not operational, because the multiple CPU synchronous interrupt
program (I45) does not work.
"Refresh Setting between Multiple CPUs" window
1. Click "Detailed Setting" at the execution timing
for each refresh.
"Detailed Setting" window
2. Enter the start/end of the device.
CPU module operating status Refresh enabled/disabled Refresh timing
CPU buffer memory Fixed scan communication
area
RUN (including a continuation error
period)
Execute refresh During the END processing Before and after the multiple CPU
synchronous interrupt program (I45)
execution
*1
STOP (including a stop error period
due to a moderate error)
Execute refresh During the END processing During the END processing
STOP (major error period) Not execute refresh
PAUSE Execute refresh During the END processing During the END processing
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