RS Automation X8 Series, Instruction Manual

Page: 67 / 327

X8 Instruction Set Reference Manual
SFR (Special Function Register) 3 - 3
Real-Time Clock Register
The real-time clock provides year, month, day of month, day of week, hour,
minute, and second information to the Real-Time Clock (RTC) data table in
the PLC.
The Real-Time Clock parameters and their valid ranges are shown in the table
below
Writing Time Data to the Real-Time Clock
There are two ways to change the RTC setting data.
The RTC settings may be changed by either the ladder program of XGPC
programming software, and a write MSG instruction from another PLCs
connected with serial or Ethernet communication.
Use the CPW (Copy Word) instruction to adjust the RTC settings within the
ladder logic as follows:
Following example shows data transmission method by using Copy Word
instruction.
Feature Address Data
Format Range Type User Program Access
YR - RTC Year RTC:0.YR word 1998…2097 Status read/write
MON - RTC Month RTC:0.MON word 1…12 Status read/write
DAY - RTC Day of Month RTC:0.DAY word 1…31 Status read/write
HR - RTC Hours RTC:0.HR word 0…23 (military time) Status read/write
MIN - RTC Minutes RTC:0.MIN word 0…59 Status read/write
SEC - RTC Seconds RTC:0.SEC word 0…59 Status read/write
DOW - RTC Day of Week RTC:0.DOW word 0…6 (Sunday to Saturday) Status read/only
DS - Disabled RTC:0/DS binary 0 or 1 Status read/only
BL - RTC Battery Low RTC:0/BL binary 0 or 1 Status read/only
IMPORTANT
An Error Code 44H is generated if any of the data being written to the
RTC data table is invalid.
For example, setting the Seconds to 61.
COPW
EN ENO
IN
#N4:0 -
1 < LEN
OUT -#RTC.0.Year