Mitsubishi MELSEC QS Series User Manual page 120

6
FUNCTIONS
(5) Operation/error history clear
6
6.8 Recording the operation contents and self-diagnostics error occurrence contents (operation/error history
- 38
function)
The operation/error history of the CPU module can be cleared by pressing the "Clear
log" button on the GX Developer PLC Diagnostics screen.
The operation/error history clear operation is only valid when the CPU module safety
CPU operation mode is TEST MODE. When the operation/error history is cleared, the
CPU module stores the operation contents OP200 : "CLEAR OPERATION/ERROR
LOG" in the operation/error history.
POINT
The operation/error history is retained by the CPU module battery.
At the power-on or the reset cancel, the CPU module checks if the operation/error
history has not been lost or damaged.
When the CPU module detects that the operation/error history has been lost or
damaged due to battery low etc., the CPU module initializes the operation/error
history.
When the CPU module initializes the operation/error history, operation contents
OP003 : "SYSTEM INITIALIZE OPE./ERROR LOG" is stored in the operation/
error history.