Multiple Cpu Synchronized Boot-Up - Mitsubishi Electric MELSEC Q Series User Manual

4.5 Multiple CPU Synchronized Boot-up

Multiple CPU synchronized boot-up function synchronizes the start-ups of CPU No.1 to CPU No.4.
Since this function monitors the startup of each CPU module, when another station is accessed by manual operation,
an interlock program which checks the CPU module startup is unnecessary.
With the multiple CPU synchronized boot-up function, the start-up is synchronized with the CPU module of slow start-
up; therefore, the system start-up may be slow.
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Multiple CPU synchronized boot-up function is to access each CPU module in a multiple CPU system without an inter-
lock.
This function is not for starting an operation simultaneously among CPU modules after start-up.
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The multiple CPU synchronized boot-up is available when the following CPU modules are used.
• Universal model QCPU (except Q00UCPU, Q01UCPU, Q02UCPU )
• Motion CPU (Q172DCPU, Q173DCPU )
(1) Multiple CPU synchronized boot-up setting
To use the multiple CPU synchronized boot-up function, check from No.1 to No.4 of Target PLC on Multiple CPU
settings in PLC parameter of GX Developer.
"Synchronize Multiple CPU boot-up" is set to No.1 to No. 4 at default.
Set the same Multiple CPU synchronous boot-up to all CPUs that constitute the Multiple CPU system.
When the all CPU modules that constitute the Multiple CPU system do not have the same setting, the stop error
3015 will occur.
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Figure 4.51 Multiple CPU synchronized boot-up setting