Mitsubishi Electric QJ71LP21 Reference Manual page 302

8 TROUBLESHOOTING
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(2) Clearing an error
If the error, which allows the operation to continue, occurs, it can be cleared by
remote I/O module as well as CPU module.
Make sure to clear the error by remote I/O module, then perform the error clear
operation by CPU module.
The error clear procedure using GX Developer is indicated below.
1) Remove the error cause of the remote I/O station.
2) Store the error code to be cleared in the special register SD50 of the
remote I/O module.
3) Turn off and on special relay SM50 of the remote I/O module.
4) The target error of the remote I/O module is cleared.
5) Store the error code to be cleared in the special register SD50 of the
CPU module.
6) Turn off and on special relay SM50 of the CPU module.
7) The target error of the CPU module is cleared.
REMARK
For a multiplexed remote I/O network for the redundant system, clear an error of the
CPU module from the control system CPU module and then on the standby system
CPU module.
When the CPU restarts after resetting the error, special relays, special registers,
LEDs, and LED display module related to the error are restored to the state
before the occurrence of the error.
After the resetting of an error, if the same error occurs again,it is registered to the
trouble history again.
If more than one annunciator is detected, error resetting operation resets only the
F number that was detected first.
POINT
Lower 2 digits of the error code stored to SD50 are ignored for error clear
operation.
(Example)
After the errors of error codes 2100 and 2111 occur, if error code 2100 is stored to
SD50 and the error is cleared, the error of error code 2111 is also cleared.
MELSEC-Q
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