10 CPU Unit Functions
10-4
CJ2 CPU Unit Software User’s Manual
Words in the Auxiliary Area automatically store the times when the power is turned ON, the times when
the power is turned OFF, the number of power interruptions, the total power ON time, the times when
the user memory (programs and parameters) is written, and the times when operation is started and
stopped. The times stored in memory must not be used if the battery is not connected or if the battery
voltage is low.
The year, month, day, and time that the PLC is turned ON is stored in the following Auxiliary Area
words.
10-1-2 Times Stored in Memory
Power ON Clock Data
Name Address Description
Power ON Clock
Data 1
A720 to
A722
The data is BCD.
A720.00 to A720.07: Seconds (00 to 59)
A720.08 to A720.15: Minutes (00 to 59)
A721.00 to A721.07: Hour (00 to 23)
A721.08 to A721.15: Day of month (01 to 31)
A722.00 to A722.07: Month (01 to 12)
A722.08 to A722.15: Year (00 to 99)
Power ON Clock
Data 2
A723 to
A725
These words contain the startup time/date for the second-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 3
A726 to
A728
These words contain the startup time/date for the third-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 4
A729 to
A731
These words contain the startup time/date for the fourth-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 5
A732 to
A734
These words contain the startup time/date for the fifth-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 6
A735 to
A737
These words contain the startup time/date for the sixth-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 7
A738 to
A740
These words contain the startup time/date for the seventh-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 8
A741 to
A743
These words contain the startup time/date for the eighth-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 9
A744 to
A746
These words contain the startup time/date for the ninth-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
Power ON Clock
Data 10
A747 to
A749
These words contain the startup time/date for the tenth-to-last time that power
was turned ON. The data is BCD and the storage format is the same as words
A720 to A722.
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