Mitsubishi Electric MELSEC-Q series User Manual page 76

2: When the 17th error occurred
Ex.
The 17th error is stored in Error history No.1, and the value "1810" (start address of error history No.1) is
stored in Latest address of error history (Un\G1800).
Latest address of error history
(Un\G1800)
74
Address
1810
Error history No.1
1st error
1820
Error history No.2
2nd error
1830
Error history No.3
3rd error
1960
Error history No.16
16th error
New
17th error
The 17th error is stored in Error history
No.1 and the 1st error history will be erased.