Real-Time Clock Data Relay Flags

Real-Time Clock Relay Flags (F400 ~ F430)

The real-time clock data relay flags, F400 ~ F430, display the year, month, date, day of the week, hour, minute, and second of the real-time clock.
These flags identify the real-time clock information of the PLC.

The real-time clock data relay flags, F400 ~ F430, are WORD data registers that can be accessed with the MOV instruction.

For more information about real-time clock data, refer to the DATERD instruction.

• The month, date, day of the week, hour, and minute flags, F410 ~ F430, should be converted to with respect to 2's complement.
  • After converting the number to binary, convert each portion of the binary number back to decimal.

Conversion Example 1

• Example 1: The flag F460 has the value 3,077.
  • Converted to binary: 0000 1100 0000 0101
    • 1100 (upper WORD) converted to decimal: 12 (month)
    • 0101 (lower WORD) converted to decimal: 5 (day)

Conversion Example 2

• Example 2: The flag F470 has the value 1,025.
  • Converted to binary: 0000 0100 0000 0001
    • 0100 (upper WORD) converted to decimal: 4 (day of the week: Thursday)
    • 0100 (lower WORD) converted to decimal: 1 (hour)

Conversion Example 3

• Example 3: The flag F480 has the value 1,288.
  • Converted to binary: 0000 0101 0000 1000
    • 0101 (upper WORD) converted to decimal: 5 (minute)
    • 1000 (lower WORD) converted to decimal: 8 (second)

Real-Time Clock Relay Flags
Flag	Item	WORD	MOV Example
F400	Year
F410	Month	Upper
	Date	Lower
F420	Day of the week	Upper
	Hour	Lower
F430	Minute	Upper
	Second	Lower