Clock Data Used By Cpu Module And Intelligent Function Module - Mitsubishi Electric MELSEC Q Series User Manual

3.8 Clock data used by CPU module and intelligent function module

This section shows the clock data used by the CPU module and the intelligent function module.
3.8.1 Clock data used by CPU module
The following shows the clock data used by the CPU module.
(1) Setting of clock data
When using the Universal model QCPU, and Motion CPU (Q172DCPU, Q173DCPU) as CPU No.s 2 to 4, the
clock data set to the CPU module of CPU No.1 is set to the CPU modules except CPU No.1.
When setting the clock data to the CPU modules other than the CPU module No.1, the clock data of the CPU
module No.1 is automatically set to them.
(2) Transmission of clock data
The CPU module No.1 sends the clock data to other CPU modules at the following timing.
The clock data to be sent are year, month, day, day of week, time, minute and second.
• At power-on of Multiple CPU system
• When turing Multiple CPU system from RESET/STOP to RUN
• At 1-second interval after starting up Multiple CPU system
Since the CPU module No.1 sets the clock data at 1-second interval, error up to 1 second occurs to the clock data of CPU
modules other than the CPU module No.1.
There are three methods of setting clock data as shown below.
• Setting with GX Developer
• Setting with programming
• Setting with time setting function (SNTP client) (Available only for a Built-in Ethernet port QCPU)
However, clock data can be configured for the CPU No. 1 in any of Universal model QCPUs, since the clock data configured
for the CPUs other than the CPU No.1 will be changed to clock data for the CPU No.1.
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When using the High Performance model QCPU and the Process CPU as CPU No.s 2 to 4, the clock data of CPU
No.1 cannot be set to other CPUs.
When using the Basic model QCPU, only the Motion CPU (Q172CPUN(-T), Q173CPUN(-T), Q172HCPU(-T),
Q173HCPU(-T)) and the PC CPU module can be used as CPU No.s 2 and 3. The clock data of the Basic model QCPU
cannot be set to other CPUs. Set clock data of each CPU.
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