547
Display and Setting of Calendar Clock
Section 8-10
8-10-1 Setting the Date and Time
The clock data can be set by the following methods.
- Setting from the System Menu
- Changing the value in numeral memory tables No. 254 and No. 255
The following explains the procedure for writing the required clock data to the nu-
meral memory tables. For the procedure for setting the clock data using the Sys-
tem Menu, refer to 6-11-2 “Displaying/Setting the Calendar and Clock” (page 215).
Reference: The clock has an accuracy of maximum monthly error of −39 to +65 seconds at a
room temperature (25_C). Adjust the error periodically to operate the clock accu-
rately.
Changing the Value in Numeral Memory Tables No. 254 and No. 255
Numeral memory tables No. 254 and No. 255 are specially used for setting the
clock data.
These memory tables cannot be allocated to the area in the host. Therefore, to
change the contents in these memory tables, write the data to be set in them into
another numeral memory table first then copy the written value to numeral
memory tables No. 254 and No. 255 using the memory table copy function.
Copy
NT31/NT31C PC
0
1
254
255
98 / 03 / 08
9 / 50 / 18
Date, hour,
minute, second
Day of week,
year, month
Date, hour,
minute, second
Day of week,
year, month
–
–
Minute, second
Date, hour
Year, month
Days of week
DM0000
DM0001
DM0002
DM0003
DM0000
DM0002
To copy a memory table, either use the PT status control area or the touch switch
“copy setting” function. Here, the procedure for copying a memory table using the
PT status control area is described. For the procedure for using the touch switch
“copy setting” function, refer to “Changing Numeric Values/Character Strings by
Pressing a Touch Switch Which Has the “Copy Setting” Function” (page 516).
Reference: The NT31/NT31C does not check the set date and time data strictly. Therefore the
data must be set correctly so that there is no discrepancy between the date and the
day of a week.
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