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8
MULTIPLE CPU SYSTEM FUNCTIONS
Each CPU module mounted on a base unit controls an I/O module and an intelligent function module, respectively.
The data communication among CPU modules on a base unit can also be performed.
• For the concept of the multiple CPU system (system configuration specifications such as mounting position
of CPU modules and assignment of CPU number and I/O number), refer to the following manual.
MELSEC iQ-R Module Configuration Manual
• For the start-up (settings and operating procedure) of a multiple CPU system, refer to the following manual.
CW Configurator Operating Manual
• The startup time of the multiple CPU system may be long depending on the system configuration of the
installed modules, boot operation, the configuration of the system parameters and CPU parameters. When
the SD memory card diagnostics is performed due to the operation such as power OFF during the access to
the SD memory card, the startup time of the multiple CPU system may be long as well.
• Create a program so that only one CPU module accesses a MELSEC-Q series module when possible. If
multiple CPU modules access a MELSEC-Q series module simultaneously, the program execution
processing (including the execution processing of interrupt programs) may be extended due to the access
waiting time.
8 MULTIPLE CPU SYSTEM FUNCTIONS
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