Canceling Errors - Mitsubishi MELSEC QS Series Programming Manual

9.2

Canceling Errors

CPU module can perform the cancel operation for errors only when the errors allow the CPU
module to continue its operation.
To cancel the errors, follow the steps shown below.
9-36
9.2 Canceling Errors
1) Read the special register SD81 with GX Developer and confirm the cause of
the continuation error that currently occurs in the CPU module.
2) Eliminate the cause of the error.
3) Store the error code to be canceled in the special register SD50.
4) Energize the special relay SM50 (OFF
5) Read the special register SD81 with GX Developer again and confirm that the
bit corresponding to the canceled continuation error is turned OFF.
6) Turn the special relay SM50 OFF.
After the CPU module is reset by the canceling of the error, the special relays, special
registers, and LEDs associated with the error are returned to the status under which the
error occurred.
If the same error occurs again after the cancellation of the error, it will be registered
again in the error history.
When multiple enunciators(F) detected are canceled, the first one with No. F only is
canceled.
If the canceling of errors is performed when multiple continuation errors are occurring,
the LED indication and error information of the CPU module operate as follows.
Error Canceling Status
Before canceling errors
The error which occurred last
is cancelled.
(The continuation error that is
not canceled remains.)
Errors other than the
continuation error that
occurred last are cancelled.
(The continuation error that is
not canceled remains.)
All the continuation errors are
cancelled.
*1: 1) Error code: When 1600 (BATTERY ERROR) occurs, only "BAT." LED turns on.
Error code: When canceling the error code 1600, "BAT." LED turns off.
2) Error code: When 9000 (F****) occurs, only "USER" LED turns on.
Error code: When canceling the error code 9000, "USER" LED turns off.
Refer to the following manual for details of error canceling.
QSCPU User's Manual (Function Explanation, Program Fundamentals)
ON).
LED Indication *1
("ERR." LED, "BAT." LED,
"USER" LED)
On
On
On
Off
Error Information
(SM0, SM1, SM5, SM16, SD0
to 26)
The error information of the
continuation error that
occurred last is stored.
Returned to the status without
error.
No change
(The error information that
occurred last is retained.)
No error