Mitsubishi Electric MELSEC iQ-R Series User Manual page 182

Alarm history
Common
Up to 16 alarms that occurred in the module are recorded.
Ex.
For alarm history No.1
b15
Un\G3760
Un\G3761 First two digits of the year
Un\G3762
Un\G3763
Un\G3764
Millisecond (upper)
Un\G3765
Un\G3766
Un\G3769
Item
Alarm code
First two digits of the
year
Month
Hour
Second
Day of the week
Millisecond (higher-order digits)
Millisecond (lower-order digits)
System area
*1 Values stored when a range change denial alarm during analog output in CH1 (alarm code: 0C00H) occurs at 12:34:56.789 on Monday,
October 31st, 2016.
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory name
Alarm history
APPX
180
Appendix 3 Buffer Memory Areas
... b8 b7
Alarm code
Month
Hour
Second
System area
Storage contents
An alarm code is stored.
Last two digits of the Stored in BCD code.
year
Day
Minute
One of the following values is stored in BCD code.
Sunday: 0, Monday: 1, Tuesday: 2, Wednesday: 3
Thursday: 4, Friday: 5, Saturday: 6
Stored in BCD code.

No.1 to No.16
3760 to 3919
... b0
Last two digits of the year
Day
Minute
Day of the week
Millisecond (lower)
*1
Storage example
0C00H
2016H
1031H
1234H
56H
1H
7H
89H
