4 AUXILIARY AND APPLIED FUNCTIONS
4.6 Clock Function
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4.6 Clock Function
The CPU No.1 PLC CPU clock data is the standard clock information added to event history and all kinds of monitor
information. The following is an overview of the clock function.
Clock data settings
Set the CPU No.1 clock data. Refer to the following for details on the CPU No.1 clock data setting method.
MELSEC iQ-R CPU Module User's Manual (Application)
The Motion CPU runs automatically based on the CPU No.1 clock data.
Clock data synchronization timing and precision
When power supply in turned ON, the clock is always synchronized with the clock data of CPU No. 1.(1ms precision)
However, for information on errors that occurred when transmission with CPU No. 1 is not established such as during initial
processing, the correct clock data may not be applied.
Clock data information
The clock data transmitted by the CPU No.1 is in year (1980 to 2079), month, day of the month, day of the week, hour, minute,
and second (1/1000th units).
Clock data reading
If using the clock data with the program, clock data can be read with the following special relay and special registers.
■Special relay
• Clock data read request (SM213)
Refer to special relays for details on special relays.(Page 426 Special Relays)
■Special register
• Clock data (SD210) (Year)
• Clock data (SD211) (Month)
• Clock data (SD212) (Day)
• Clock data (SD213) (Hour)
• Clock data (SD214) (Minute)
• Clock data (SD215) (Second)
• Clock data (SD216) (Day of week)
Refer to special registers for details on special registers. (Page 431 Special Registers)
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