Mitsubishi FX1N Series Programming Manual

FX Series Programmable Controllers Assigning System Devices 9
9-2
9.2 Real Time Clock Function
The time data of a RTC cassette or chip (built in to FX1S and FX1N) is battery backed. This
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
Function Range
Device
Number
Comments
D8013 Seconds 0 to 59
M8015
Time
setting
Set ON to stop the clock.
When the clock is stopped the
time values can be reset.
The clock restarts when the flag
is reset to OFF.
D8014 Minutes 0 to 59
D8015 Hours 0 to 23
D8016 Date
1to31(correctfor
current Month)
M8016
Register
Hold
Theclockdatainthedataregis-
ters is held. The clock still runs.
Usethistopausethedatato
read the current time.
D8017 Month 1 to 12
D8018 Year
00 to 99 (1980 to
2079)
M8017
Minute
Rounding
When on rounds the time up or
down to the nearest minute.
D8019
Day of
Week
0 to 6 (Sunday to Sat-
urday
M8018
Clock
Available
Automatically set to indicate the
RTC is available.
M8019
Setting
Error
ON when the values for the RTC
are out of range.
FX 1S FX 1N FX 2N
FX 2NC
FX 1S
FX 1N FX 2N FX 2NC

Mitsubishi FX1N Series Specifications

General

Brand	Mitsubishi
Model	FX1N Series
Category	Controller
Language	English