Real Time Clock Function; Setting The Real Time Clock - Mitsubishi FX1S Series Programming Manual

FX Series Programmable Controllers
9.2

Real Time Clock Function

The time data of a RTC cassette or chip (built in to FX
means when the PLC is turned OFF the time data and settings are not lost or corrupted. The
duration or storage life of the timedatails dependent upon the condition of the battery.
The real time clock has a worst case accuracy of ± 45 seconds per month at an ambient
temperature of 25°C. The calendar function of the RTC caters for leap years during the period
1980 through 2079.
9.2.1

Setting the real time clock

The RTC can be set using the special data registers and control flags as follows:
Device
Number
D8013
D8014
D8015
D8016
D8017
D8018
D8019
Function Range
Seconds 0 to 59
Minutes 0 to 59
Hours 0 to 23
1 to 31 (correct for
Date
current Month)
Month 1 to 12
00 to 99 (1980 to
Year
2079)
Day of 0 to 6 (Sunday to Sat-
Week urday
Assigning System Devices 9
FX FX
1S
and FX ) is battery backed. This
1S 1N
FX FX
1S
Device
Number
Set ON to stop the clock.
M8015 When the clock is stopped the
Time time values can be reset.
setting The clock restarts when the flag
is reset to OFF.
The clock data in the data regis-
M8016
ters is held. The clock still runs.
Register
Use this to pause the data to
Hold
read the current time.
M8017
When on rounds the time up or
Minute
down to the nearest minute.
Rounding
M8018
Automatically set to indicate the
Clock
RTC is available.
Available
M8019
ON when the values for the RTC
Setting
are out of range.
Error
FX FX
1N 2N 2NC
FX FX
1N 2N 2NC
Comments
9-2