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CHAPTER 4 STARTING UP MULTIPLE CPU SYSTEM
4
4.4 Clock Data
4.4.1 Clock data of CPU modules
4.4 Clock Data
This section describes clock data of CPU modules and intelligent function modules.
4.4.1 Clock data of CPU modules
Set clock data to CPU No.1 in the multiple CPU system using the programming tool.
[Online] [Set Clock]
The clock data settings for CPU No.2 to No.4 differ depending on the CPU module used.
● Clock data can also be set by the following methods.
• By a program
• By executing the time setting function (SNTP client) (Only Built-in Ethernet port QCPUs support this function.)
● To automatically set the clock data of CPU No.1 to a C Controller module, perform the following operation.
• When the Q12DCCPU-V is used
Enable the clock synchronization function using C Controller setting utility. (The function is disabled by default.)
C Controller setting utility [Online Operation] "C Controller Module Detail Setting" "Clock" "Clock
Synchronization Function"
• When the Q24DHCCPU-V or Q24DHCCPU-LS is used
Clock data do not need to be set. The clock data of CPU No.1 is automatically set.
● If there is an error of three seconds or more between the clock data of the C Controller module (Q12DCCPU-V,
Q24DHCCPU-V, or Q24DHCCPU-LS) and the clock data received from CPU No.1, the C Controller module synchronizes
the clock data.
Remark
CPU No.1 sends clock data to other CPU modules at the following timing.
• When the multiple CPU system is powered on
• When the RUN/STOP switch of CPU No.1 is switched from STOP to RUN
• At intervals of one second after the multiple CPU system starts up
The clock data includes year, month, day, day of the week, hour, minute, and second information.
Since CPU No.1 sets the clock data at intervals of one second, an error of one second (maximum) may occur in clock data
of CPU modules other than CPU No.1.
CPU module Setting of CPU No.2 to No.4
• Universal model QCPU
• Motion CPU (Q172DCPU(-S1), Q173DCPU(-S1), Q172DSCPU, or
Q173DSCPU)
• C Controller module (Q12DCCPU-V, Q24DHCCPU-V, or
Q24DHCCPU-LS)
Clock data do not need to be set. The clock data of CPU No.1 is
automatically set to CPU No.2 to No.4.
Even if clock data is set individually to CPU No.2 to No.4, the
setting is ignored and the clock data of CPU No.1 is
automatically set.
Other than above
Set clock data individually to CPU No.2 to No.4.
The clock data of CPU No.1 is not automatically set to CPU No.2
to No.4.