1 MULTIPLE CPU SYSTEM
1.3 Data Communication Between CPU Modules in the Multiple CPU System
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Inter-module synchronization function
Inter-module synchronization function overview
• By using the inter-module synchronization function, control timing can be synchronized across Motion CPUs, I/O modules,
and intelligent function modules. By enabling inter-module synchronization for modules controlled by a Motion CPU, motion
control and synchronized I/O control are possible.
• With the inter-module synchronization function, each module executes a "Inter-module synchronization interrupt program"
to perform fixed-cycle control. At the Motion CPU, overall Motion CPU fixed-cycle processing (Motion SFC fixed-cycle
event tasks, motion operation processing, etc.) corresponds to the inter-module synchronization interrupt program.
• By enabling the inter-module synchronization function between Multiple CPUs, the execution timing for self CPU Motion
CPU fixed-cycle processing and other CPU inter-module synchronization interrupt programs (PLC CPU 144 interrupt
program, Motion CPU fixed-cycle processing) can be synchronized.
• Set the inter-module synchronization function in the following cases.
Refer to the following for details on the overall system inter-module synchronization function, including PLC
CPUs and network modules.
MELSEC iQ-R Inter-Module Synchronization Function Reference Manual
Inter-module synchronization setting
Set the inter-module synchronization settings in [System Parameter] [Synchronization Setting within the Modules]
"Synchronization Setting within the Modules" of GX Works3. Inter-module synchronization settings must be consistent across
the Multiple CPU system.
• When using I/O module signals as high-speed input request signals
• When using a synchronous encoder via a high-speed counter module (By enabling inter-module synchronization, variations between synchronous encoder
input value operation cycles are reduced.)
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