6F3B0253
88 T1-16S User’s Manual
6. Programming Information
6.3 Real-time clock/calendar (Enhanced model only)
The T1-16S enhanced model is equipped with the real-time clock/calendar for year,
month, day, day of the week, hour, minute, and second.
These data are stored in the special registers SW07 to SW13 by 2- digit BCD format
as follows.
Register Function Data
SW07 Year 1999 = H0099, 2000 = H0000, 2001 = H0001, 2002 = H0002 ...
SW08 Month Jan. = H0001, Feb. = H0002, Mar. = H0003, ... Dec. = H0012
SW09 Day 1st = H0001, 2nd = H0002, 3rd = H0003, ... 31st = H0031
SW10 Hour H0000, H0001, H0002, ... H0022, H0023
SW11 Minute H0000, H0001, H0002, ... H0058, H0059
SW12 Second H0000, H0001, H0002, ... H0058, H0059
SW13 Week Sun. = H0000, Mon. = H0001, Tue. = H0002, ... Sat. = H0006
Program example:
In the following circuit, output Y030 turns ON for 1 minute at every Sunday 6 pm.
Clock/calendar back up:
The clock/calendar continues updating even while the power to the T1-16S is off by
built-in capacitor and by the optional battery (CR2032) if used. Its buck-up period is as
follows.
Expected value Guarantee value
Environment
temperature Capacitor Battery Capacitor Battery
Under 30 °C (86 °F) 2 hours 2 year 1 hours 1 year
Over 30 °C (86 °F) 1 hours 1 year 30 minutes 6 months
As shown in the table, it is recommended to use the optional battery when the real-
time clock/calendar function is used.
In the T1-16S, the validity of the clock/calendar is checked. If the data is not valid by
excess power off period, special relay S00A is set to ON. Therefore, when the
clock/calendar is used, it is recommended to check the status of S00A in the user
program.
Setting the clock/calendar:
To set the clock/calendar data, the following 2 ways are available. In both cases, the
week data is automatically calculated.
(1) Setting the clock/calendar data on the system information screen of the
programming tool.
(2) Using the Calendar Set instruction (CLND) in the user program.
(H0018)