Multiple Cpu Synchronous Startup Setting - Mitsubishi Electric MELSEC iQ-R Series User Manual

15.2

Multiple CPU Synchronous Startup Setting

By synchronizing the start-up time of each CPU module, data can be accessed among multiple CPUs at the time unified in a
system.
There is no need for an interlock program that monitors the startup time of another CPU module when
accessing the module. Note, however, that the startup of the entire system delays because the system starts
up with the last CPU module.
Precautions
This setting can synchronize the start-up time of each CPU module; however, it does not synchronize the Windows start-up of
this product.
To send/receive data (including returned data) to/from another CPU module in a multiple CPU system, an interlock program is
required for monitoring the start-up of Windows on which a user program runs. Execute an interlock program which notifies
the Windows start-up (such as when data is written from the Windows side user programs).
Synchronous startup setting
To synchronize the startup time, set "Synchronize" for "Synchronous Startup Setting."
[System Parameter]  [Multiple CPU Setting]  [Operation Mode Setting]  [Synchronous Startup Setting]
Window
Displayed items
Item
PLC No.1
PLC No.2
PLC No.3
PLC No.4
• Group setting for synchronous startup is available. For example, a setting in which only CPU No.1 and No.2
start synchronously in a multiple CPU system with four CPU modules is possible.
• If a reserved (empty) CPU is specified to synchronize, the reserved CPU is ignored and the other CPU will
be started.
15 MULTIPLE CPU SYSTEM FUNCTION
152
15.2 Multiple CPU Synchronous Startup Setting
Description
Set whether to 'Synchronize' or 'Do not Synchronize' rising of PLC No.1
Set whether to 'Synchronize' or 'Do not Synchronize' rising of PLC No.2.
Set whether to 'Synchronize' or 'Do not Synchronize' rising of PLC No.3.
Set whether to 'Synchronize' or 'Do not Synchronize' rising of PLC No.4.
Setting range Default
• Synchronize Synchronize
• Do not
Synchronize