Mitsubishi Electric MELSEC iQ-R User Manual page 51

Ex.
The following shows the case in which the 17th error has occurred. The 17th error is stored in Error history No. 1 and Latest
address of error history (Un\G8000) is overwritten with 8010 (start address of Error history No.1).
Latest address of error history
(Un\G8000)
Address
8010
8020
8030
8160
If the storage areas of the error history become full, the value in Error history No. 1 (Un\G8010 to Un\G8019)
is overwritten and sequentially thereafter to keep registering errors. (The error histories before the overwriting
are deleted.)
Error history No.1
1st error
Error history No.2
2nd error
Error history No.3
3rd error
Error history No.16
16th error
Latest
17th error
The 17th error is stored in Error history No.1
and the 1st error history will be erased.
1.6 Error History Function
1
1 FUNCTIONS
49