10-3
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-1 Clock Functions
10
10-1-1 Clock Functions
10-1 Clock Functions
A clock is built into the CJ2 CPU Units.
The clock data from the clock in the CPU Unit is stored in the following bits in the Auxiliary Area in BCD.
If the battery is not connected or the battery voltage is low, the clock data in words A351 to A354 will be
unstable. Do not use the clock data unless a reliable battery is connected.
The data can be set by connecting the CX-Programmer online and double-clicking the PLC Clock Icon
in the project tree or by executing the DATE(735) instruction. Also, clock data can be incremented and
decremented and converted between seconds and hours.
z Clock Instructions
10-1-1 Clock Functions
Clock Data
Name Address Description
Clock Data A351.00 to
A351.07
Seconds: 00 to 59 (BCD)
A351.08 to
A351.15
Minutes: 00 to 59 (BCD)
A352.00 to
A352.07
Hour: 00 to 23 (BCD)
A352.08 to
A352.15
Day of the month: 01 to 31 (BCD)
A353.00 to
A353.07
Month: 01 to 12 (BCD)
A353.08 to
A353.15
Year: 00 to 99 (BCD)
A354.00 to
A354.07
Day of the week (00 to 06 BCD):
00: Sunday, 01: Monday, 02: Tuesday, 03: Wednesday, 04: Thursday,
05: Friday, 06: Saturday
Setting Clock Data
Instruction Mnemonic Function
CLOCK ADJUSTMENT DATE(735) Changes the internal clock setting to the setting in the specified
source words.
HOURS TO SECONDS SEC(065) Converts time data in hours/minutes/seconds format to an equiva-
lent time in seconds only.
SECONDS TO HOURS HMS(066) Converts seconds data to an equivalent time in hours/minutes/sec-
onds format.
CALENDAR ADD CADD(730) Adds time to the calendar data in the specified words.
CALENDAR SUBTRACT CSUB(731) Subtracts time from the calendar data in the specified words.
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