Error History Function - Mitsubishi Electric MELSEC-Q series User Manual

4.15

Error History Function

Errors and alarms that occurred in the CT input module are stored in the buffer memory (Un\G1810 to Un\G1969) as a
history.
The maximum of 16 errors and alarms can be stored.
(1) Process of the error history function
The error code and the error time are stored in the buffer memory area, starting from Error history No.1 (start
address: Un\G1810) in order. Error time is stored as follows.
For error history No. 1
Ex.
Un\G1810
Un\G1811
Un\G1812
Un\G1813
Un\G1814
Un\G1815
Un\G1819
Item
First two digits of the
year/Last two digits of the
year
Month/Day
Hour/Minute
Second
Day of the week
*1 This is the example of error occurrence at 10:35:40 on Tuesday, March 29th, 2011.
● The process for an alarm is the same as the one for an error.
● Once the error history storage is full, existing data are overwritten, starting from those in Error history No.1 (Un\G1810 to
Un\G1819) in order; a new error history replaces existing one.
● The stored error history is cleared when the power is turned off or the CPU module is reset.
72
b15 to
First two digits of the year
Month
Hour
Second
Stored in BCD code.
The value that corresponds to the day of the week is stored in
BCD code.
• Sunday: 00
• Tuesday: 02
• Thursday: 04
• Saturday: 06
b8 b7 to
Error code
Last two digits of the year
Day
Minute
Day of the week
System area
Stored data
• Monday: 01
• Wednesday: 03
• Friday: 05
b0
*1
Example
2011
H
329
H
1035
H
40
H
02
H