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6.5 Multiple CPU synchronous startup
This function synchronizes the startups of CPU No.1 to No.4.
Since the function monitors the startup of each CPU module, an interlock program normally used to check the startup
of another CPU module before accessing is no longer required. This function, however, synchronizes the startups with
the slowest one. As a result, the startup of the system may be slow.
This is the function to access each CPU module in a multiple CPU system without an interlock, not to start operations
simultaneously among CPU modules after startup.
(1) Parameter setting
To use the function, select target CPU modules in "Multiple CPU Synchronous Startup Setting" of PLC parameter
("Multiple CPU Setting") using the programming tool. All the CPU modules are selected by default. (The startups
of all the CPU modules are synchronized.)
Setting of this parameter must be the same for all the CPU modules in the system.
If not, "PARAMETER ERROR" (error code: 3015) will be detected.
(2) Applicable CPU modules
The multiple CPU synchronous startup function can be executed when any of the following CPU modules is
used.
• Universal model QCPU (except the Q00UCPU, Q01UCPU, and Q02UCPU)
• Motion CPU (Q172DCPU(-S1), Q173DCPU(-S1), Q172DSCPU, or Q173DSCPU)
• C Controller module (Q12DCCPU-V, Q24DHCCPU-V, or Q24DHCCPU-LS)