Chapter 23 Multiple Cpu System Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

23
MULTIPLE CPU SYSTEM FUNCTION
With multiple CPU modules mounted on the base unit, each of the CPU modules controls their own assigned I/O modules and
intelligent function modules. In addition, the CPU modules communicate with each other.
• For details on the concept of the multiple CPU system configuration specification (System configuration
specifications such as the mounting position of the CPU modules and assignment of CPU number/IO
number), refer to the MELSEC iQ-R Module Configuration Manual.
• For the start-up (Setting, operating procedures, etc) of the Multiple CPU system, refer to the GX Works3
Operating Manual.
• This function cannot be used when the Process CPU is in redundant mode.
• The startup time of the multiple CPU system may be slowed, depending on the configuration of installed
modules, boot operation, functions performed before CPU modules enter into the RUN state (e.g. setting of
initial device/label values), the configuration of system parameters and CPU parameters (e.g. the number of
programs to run).
• When diagnostics of the SD memory card is performed due to operation such as power-off during access to
the SD memory card, the startup time of the multiple CPU system may be slowed.
• Create a program so that only one CPU module accesses the Q series module, if possible. If multiple CPU
modules access the Q series module simultaneously, the scan time (including the execution processing of
interrupt programs) may be extended due to access waiting time.
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