Mitsubishi Electric MELSEC iQ-R Series User Manual page 95

Alarm history
Up to 16 alarms that occurred in the module are recorded.
Ex.
For alarm history 1
b15 ...
Un\G960
Un\G961
Un\G962 First two digits of the year
Un\G963 Month
Un\G964 Hour
Un\G965 Second
Un\G966 Millisecond (upper)
Un\G967
Un\G969
Item
Alarm channel
Alarm code
First two digits of the year Last two digits of the year
Month Day
Hour Minute
Second
Day of the week
Millisecond (higher-order digits)
Millisecond (lower-order digits)
System area
*1 Values stored when a warning output (upper limit) (alarm code: 0800H) occurs on CH1 at 12:34:56.789 on Wednesday, October 31st,
2018.
■Buffer memory addresses
The following shows the buffer memory addresses of this area.
Buffer memory name
Alarm history
b8 b7 ...
Alarm channel
Alarm code
Last two digits of the year
Day
Minute
Day of the week
Millisecond (lower)
System area
Stored data
Stores the number of the channel on which the alarm occurred.
Stores the alarm code.
Stored in BCD code.
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
960 to 1119
b0
Example of stored data
1H
0800H
2018H
1031H
1234H
56H
3H
7H
89H

Appendix 3 Buffer Memory Areas
*1
A
APPX
93