Mitsubishi Electric MELSEC iQ-R Series Reference Manual page 19

Inter-module synchronous interrupt
The interrupt program is executed at the inter-module synchronization cycle timing set in the parameters. The interrupt
program executed at each inter-module synchronization cycle is called the inter-module synchronous interrupt program. For
details on the inter-module synchronous interrupt program, refer to the manual for each CPU module.
• Write the program for controlling the synchronization target in the inter-module synchronous interrupt
program.
• The operation when an interrupt cause occurs and the methods of creating the program, etc., are the same
as a normal interrupt program.
■Execution timing
The inter-module synchronous interrupt program is executed at the inter-module synchronization cycle timing. The inter-
module synchronization cycle can be changed with the parameter settings. (Page 34 Inter-Module Synchronization
Setting)
■Multiple interrupt
For details on the inter-module synchronization (I44) multiple interrupt function, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
Refresh timing according to CPU module's operation status
This section shows the refresh timing according to the CPU module operation status.
For C Controller module, the refresh timing is before and after an inter-module synchronous interrupt program
since an inter-module synchronous interrupt program is executed even when the operating status of C
Controller module is STOP. For more details, refer to the following manual.
MELSEC iQ-R C Controller Module User's Manual (Application)
■Operation at STOP (RUNSTOP)
*1
At STOP , the CPU module stops the execution of the inter-module synchronous interrupt program, and turns the output
OFF. Refreshing is executed even during STOP. Note that refreshing will not be executed the specified inter-module
synchronization cycle (fixed cycle), but will be executed at the END process.
*1 This includes CPU module stop errors.
■STOPRUN operation
The CPU module issues the inter-module synchronization start instruction to each module at the inter-module synchronization
cycle after STOPRUN. The inter-module synchronous interrupt program execution starts at the next inter-module
synchronization cycle. The refresh timing changes from the END process to before and after the inter-module synchronous
interrupt program.
*1 The operation is the same at Power ONRUN.
*1
5 FUNCTION
5.1 Fixed Cycle Synchronization Function
5
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